Two-component model putty. Putty in bench modeling. But they also have their drawbacks
Dmitry Ignatichev is in touch with you again - your guide to the world of large-scale modeling!
Any large-scale modeler, one way or another, faces the task of puttingtying the joints of glued parts, repairing scratches and chips. And sometimes you have to deal with the restoration of a large or small part lost as a result of some “accident”.
IN GENERAL, PUTTY IS AN INEVITABLE AND FAITHFUL COMPANION OF THE MODELIST
But in order for her to become your friend, you need to understand her. Just like everything else in this world. It is necessary to acquire initial knowledge about the puttying process itself, the types used to create prefabricated scale models product samples. And, of course, gain long-lasting practical experience. Practice is the only way to knowledge.
PUTTY FOR ASSEMBLY SCALE MODELS WHAT IS THIS?
In large-scale modeling, two types of putty are used
- Two component epoxy compounds
- One component “plastic” compositions
First type compositions are used for sealing " big holes» - deep cracks, chips, broken parts. Their distinctive feature is uniform hardening throughout the entire volume. True, this is only possible if we create correct proportion. They are also much more durable than “plastic” types of putty. In this characteristic they are inferior only to the plastic of the model itself.
The most common putties for large-scale prefabricated models of this type are the English MultiPut and the Japanese Tamiya Epoxy Putty.
If you want to achieve an effect comparable to the effect of these putties, you can look into shops for motorists. Ask there " cold welding" There are many of these on sale now.
BUT THEY ALSO HAVE THEIR DISADVANTAGES
- It is required to pay special attention to drawing up the proportions when kneading. In case of an error, it will either “stand up” very quickly, but will crumble greatly during further processing; or it won’t harden at all. Then you will have to pick it out of the recesses and repeat the whole process again.
- They often have a long drying period. Something in the size of a day. Although you can “stir up” a quickly drying solution - in everyday life we call it “five minutes”.
- To apply it in a thin layer requires a lot of practical experience. In this application, they do not stick well to the plastic, and always tend to break off at the most inopportune moment.
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| Tamiya Scale Model Putty |
Second type putty compositions for prefabricated scale models are a thick, homogeneous mass. As it freezes, it turns into something like model plastic. These putties, in my deep conviction, are the most common among manufacturers of plastic models and chemicals. These include Japanese Tamiya Basic Putty, Italian Italeri, German Revell, American Red and Green Putty from Squadron and many, many others. Many well-known experts in Russia advise using Japanese putty Mr. White Putty - when it dries, it forms a good, fairly strong white mass. It does not flake and is perfectly processed. It cannot always be found in online stores in our Fatherland. But this issue can always be resolved with the help of . Of those that are almost always available, Tamiya Basic Putty is good.
THE MAIN DISADVANTAGE OF THIS TYPE OF COMPOSITIONS
The main disadvantage of this type of composition is uneven drying. It happens that the top layer has already “risen”, but the deeper layer has not yet. We have to wait. A simple practice test will resolve all your questions.
There are also problems in the form of fragility of the surface created by putty. It may crumble and interfere with further processing.
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| Revell Scale Model Putty |
OLD FOLK RECIPES
A Russian modeler is akin to a real entrepreneur. He is always looking for opportunities to use what is at hand. When it is not possible to get specialized drugs. Or they are not effective enough. Then a variety of folk recipes are used.
The most common version of homemade one-component putty is created using a small bottle of model glue, and big the amount of plastic shavings, and the sprue crushed into shavings. It infuses like wine - very long and thoroughly. Stir regularly to achieve a uniform consistency. If necessary, add a new portion of plastic shavings. The result is a viscous jelly-like substance. It covers a variety of defects well. Not great, of course. This method came to us from the distant Soviet past. When you needed everything get. Now it has lost its former popularity. Although experienced modelers often use and recommend it.
DISADVANTAGES OF THIS METHOD OF PUTTYING PREFABRICATED MODELS
Extremely long preparation time. It also takes a long time to dry. Gives strong shrinkage along the profile. You will have to putty your area more than once. When drying, bubbles may appear on the surface.
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THE EASIEST RECIPE FOR HOME-MADE PUTTY MODELS
We drip a little cyacrine onto the area that we want to tidy up. Then we take soda or, at worst, talc. And put them in glue. It is advisable to drip this area with cyacrine again. When the mixture dries, it will become a dense, solid mass. Sticks perfectly to the surface. It sands tolerantly enough. Tolerable because it is harder than plastic.
And finally...
SMALL PUTTY Trick
Now, with the development of the production and design base of scale model manufacturers, we increasingly have plastic with an excellent degree of joining of parts. But there is a small gap when connecting them. As when creating a model. And since we have a surface with a carefully worked jointing, we highly undesirable polish it!
And then we will do this...
We take out a tube of sulfur Tamiya Basic Putty. We beg our wife (sister/mother/friend) for nail polish remover. A mask is applied to the gap along the edges of the joint. Then it is puttied (for example, using a toothpick or dental spatula). Let the putty dry a little (but not completely). Then dip a cotton swab in nail polish remover and carefully wipe off excess putty from the surface of the plastic. Since the liquid is not aggressive to plastic, the surface of the parts remains undamaged. The slightly dissolved putty comes off, albeit with some effort. As a result, we get a smooth joint surface.
I think I've told you in detail basic knowledge about puttying prefabricated scale models. If you have any questions, write. In the comments. Join our groups on social networks.
That's all for today. Good luck to you. And wonderful models!
P.S. What kind of putties do you use? Write in the comments!
Probably, there are no models on planet Earth, during the construction of which the modeler would not have to putty numerous cracks... This process is quite labor-intensive: first we putty, wait until the putty dries, and usually it also dries out - we have to repeat the process two or three times, then we grind for a long, long time with water (this is so that the sandpaper does not become clogged) or smelly kerosene (if the sandpaper is not waterproof), which spoils our health, and final stage polish the seam. It is worth noting that in the last two stages the putty often crumbles; this also happens when restoring jointing that was damaged during the sanding stage, it is clear that this does not add any pleasure. And then, friends, the worst thing happens - modeling from a hobby that brings pleasure turns into a tedious job, which each of us already has enough of. So, humanity, on the path of its progressive development, has developed several ways to solve the problem, but all of them are not without drawbacks:
1. We cover the area of the model around the seam with tape in order to preserve the jointing, and putty, grind, and polish. With the exception of everything described above, when using this method, either the adhesive tape is simply erased along with the excess putty, or when removing the latter, a step is formed that stands out on smooth surface models. Sanding it means erasing the jointing in the seam area.
2.Dilute the putty with solvent to the consistency of kefir-ryazhenka and pour this mixture into the seam. Plus: no sanding required. Cons: the putty tends to flow anywhere, but only away from the seam, and when it dries, it shrinks as many times as you added solvent (normally 4-6 times).
3. Seal the cracks with pieces of plastic. But at the same time, cracks remain again, although small, but not necessarily, requiring puttying. 4. Dry fitting of parts before gluing. I use this method always and everywhere, as it allows me to see and eliminate all the shortcomings of the plastic. Disadvantage: it violates the geometry of the model relative to the prototype. After such torment, you no longer experience the spiritual relaxation you get from your hobby. And when showing models to fellow modelers, I have to justify myself, saying that the plastic was so poor... The same thing happened to me until recently, until experienced colleagues led me to the path of truth. Mikhail Nerdakov, Will Hendriks, thank you very much!!! So, enough of “pouring water” on the essence of putty – let’s get down to business!
Stage one, fundamental: It consists of masking the seam area with tape (so as not to accidentally stain the model with putty) and applying the putty itself. Special attention(!!!) attention should be paid to the choice of putty. I suggest the fairly common Tamiya Putty. Note, not epoxy! Epoxy is not suitable for these purposes! The putty is applied as usual, as always, there is no need to dilute it with anything! To apply putty, I use a set of Chinese watch screwdrivers - very convenient and cheap.
Stage two, chemical: After waiting until the putty is completely dry (I leave it to dry overnight), we remove the excess with nail polish remover (don’t be surprised). Here, as when choosing putty, you should pay attention to the choice of liquid. Main criterion— IT MUST BE WITHOUT ACETONE! The fact is that acetone is harmful to plastic! For this operation, we use an ear stick (“earwig”) or a match with a wound piece of cotton wool. Don't press the match too hard. You should carefully and smoothly hold the match without stopping in one place. This will allow you to achieve the smoothest and highest quality seam possible. Don’t forget to also periodically change the cotton wool soaked in nail polish remover.
Stage three, final: Now all that remains is to use a needle to remove unnecessary putty from the jointing lines, if any, and polish the seam (optional) with a soft cloth to give it a texture similar to plastic
Well, that's it! Postscript: It's not always possible to buy Tamiya Putty. With equal success, you can use Nitrosoft automotive nitro putty from Body. Its only drawback is that it has poor adhesion to plastic. It can be eliminated by adding butyl acetate (model glue) in the proportion of 1-2 ml of glue per 10-15 ml of putty. But the glue creates fibers in the putty that are difficult to remove with nail polish remover. In addition, the fibers affect the consistency of the putty, and it becomes “stringy,” which adds to the hassle. You have to remove the fiber pellets with sandpaper (the finest) or a piece of cloth. And one more thing. If the nail polish remover you have chosen does not dissolve the putty, you can add a couple of drops (no more!!!) of acetone to it, after making sure that the acetone does not dissolve the plastic of the particular model you have chosen (on a piece of sprue). I recommend using Welltex acetone (sold in car dealerships); it is neutral to plastic ICM, VE, Zvezda (this is not full list, just what I had on hand). By the way, all Welltex solvents are of high quality and low price.
Not long ago we looked at some methods for assembling a model, which allow, if not avoiding, then at least minimizing putty work.
I probably won’t be wrong if I call this work the most tedious stage.
To many (but not all) something will seem too simple and has been known for a long time.
Let's try to cut corners a little.
Let's get started
The rules as old as time apply here:
1. Take your time
2. The better (more often and more expensive) the materials used, the faster and better the result.
I met many people who expressed some special opinion regarding this or that model putty in the form of a paste in a tube. At one time I tested Humbrol, Revell and Tamiya, as well as several cheaper and little-known analogues. I was not satisfied with the quality of any of them.IN at the moment completely switched to:
First, we will try to get rid of unnecessary work and then restore the jointing. I protected the jointing lines with the first quality tape I could find.
Next, apply a layer liquid putty with a thin and flat brush. The layer is applied with a small slide, taking into account the shrinkage of the material.
It is necessary to wait until the putty begins to dry out a little - a matte crust will be the signal. Then, using a cotton swab dipped in solvent, we remove excess chemically. It does not damage the plastic, washing away excess putty.
Consistently, without strong pressure, we “smooth” the joint.
At this stage, a thorough drying of 10 hours and an audit of the work done is required. In most cases, re-puttying is not required, but if necessary, everything can be repeated.
The seam is first sanded with 1000-1200 grit sandpaper, then 1500-2000 grit, depending on the circumstances. Please note that the skin MUST be damp and washed regularly. Otherwise, instead of sanding, you'll just create more scratches.
As you can see, you can get creative even with such tedious work as putty.
So, if you are a novice modeler, then most likely you have already asked the question - how and how to deal with cracks and scratches that occur on the model body during assembly. It's very simple - you just need to use putty.
putty- This is most often a paste-like or powdery substance intended for leveling the surface between model parts.
Currently, a huge number of types of putty are produced and they all differ in their properties.
The right choice putty depends on large quantity factors such as
model material
seam width, or scratches
seam location
Types of putty:
- Putty
- Epoxy resin
- Automotive putties
- Super glues
In most cases, a special nitro-based modeling putty - Putty - is suitable for bench modeling. The putty comes in a metal tube, in gray or white, is applied tightly and dries quickly. It is possible to liquefy it to the desired consistency using a native (or domestic 600th) solvent. There is a drawback after completely dry- the putty is fragile and shrinks a lot. For this reason, Putty is not suitable for sculpting figures. If putty diluted quite thinly, it must be applied in layers, allowing time for each layer to dry completely. You need to remember - the more the putty is diluted, the stronger the shrinkage will be and the longer it will take to dry.
Model putty is produced by almost all well-known brands: Tamiya, Revell, Humbrol, Model Master, Italeri
The use of this type of putty clearly goes beyond simply filling cracks and seams. For example, it is very convenient to use when making dioramas. - represents two fine-grained materials that harden only from thorough mutual mixing of the components. Well-mixed putty is applied to the model using a spatula or pressing with your fingers with little force.
Ideal for sculpting figures, making and copying parts for aircraft, tanks and other equipment. After thoroughly mixing the two components during hardening, a moment comes when the putty does not stick to the model or to the fingers. This is very convenient when sculpting and giving the desired shape.
It takes 24 hours for complete hardening. You can reduce this time by placing it on the battery.
- two-component polyester putty. - does not shrink and dries quite quickly and is suitable for those that require puttying in large volumes.
To prepare putties To use, you need to squeeze the putty and hardener in a ratio of 50:1 onto a hard surface and mix thoroughly in a circular motion. For better stitching, it is best to use a miniature flat spatula.
The main disadvantage of this type of putty is its strong and bad smell, for this reason it is best to work with it in a ventilated area.
Keep in mind that if remains sticky even the next day, then most likely it was mixed with a small amount of hardener or it has simply expired.
(green)
Two-component epoxy putty. Consists of two ribbons - blue and yellow, when mixed it turns out green. After obtaining a uniform green color, the putty is ready for use. For this reason, its name is common among modellers - brilliant green. The blue tape is the hardener, the yellow tape is the base material. The more blue, the stronger the putty. By the shade of green you can control the properties of the mass. To ensure that the putty does not stick while working, it is necessary to wet the tool and hands. Working putty can be stored in a container and refrigerator.
Other puttying methods
There are other types of materials for the same tasks, but which are not model putties.
Epoxy resins
Conventional two-component epoxy resins can also be used as a placeholder. There are different varieties, from hardening in 5 minutes to 24 hours. The main advantage of this type is that they practically do not shrink and do not destroy the plastic. Disadvantage - they do not stick well, unlike those made on the basis of solvents.
Automotive putties
This is probably the most popular type of aggregate developed for non-modeling purposes. There are a lot of them. Automotive putties are usually solvent-based and adhere well to plastic. And for this reason, they become very strong when completely dry.
Super glue
Superglues are good to use if you need to fill small cracks or scratches, as they fill the space without bubbles. Super glue practically does not shrink. The speed at which the glue dries completely depends on air humidity.
How did you understand that it doesn't exist? ideal material for all tasks. Each of them has its pros and cons. By understanding all the differences and putting them into practice, you will get best experience, which will take your models to the next level.
>> >> Putty in bench modeling
Now, during the assembly of a custom-made An-12 from Roden, the model has to be puttied a lot, with different types of putty. Therefore, I decided to write a short review on putties for models.
In the mid-80s - early 90s, when I was involved in a ship modeling circle, the most popular putty for models was nitro putty of the NTs brand, gray. She puttyed everything: fiberglass hulls, soldered superstructures and wooden blanks, because nothing else was widely available. Then I started studying plastic models and again, during the assembly process, it was necessary to somehow putty them. If anyone knows about NOVO-FROG products and vacuums, he will understand what I’m talking about. In the early 90s, our modelers, with rare exceptions, had neither seen nor even heard of overseas chemistry for modeling. All available means were used for the work. For plastic we tried the same “NTs”, but it was not possible to cut seams on it, it crumbled and did not adhere very well to plastic surface. The most acceptable results were obtained when the sprue was dissolved in . Now, with the advent of all kinds of chemistry for models, you need to clearly understand what is what and how to use it. Putties, roughly speaking, can be divided into two types.
1) one-component nitro-based
2) two-component epoxy
The first type includes compositions from various model manufacturers: Tamiya, Revell, Humbrol, Italeri. In my opinion, the most best results gives a product from Tamiya.
It dries quite quickly and after processing gives good surface. It cuts jointing well. At one time, I tried putty from Humbrol, but when cutting the seams there were chips. When working with one-component compositions, I encountered one unpleasant issue: after priming and then painting the surface with nitro enamels, shrinkage appears. Thus, when filling a gap with Tamiya one-component putty on the Me-262 model, after painting, a gap appeared as a result of shrinkage. It is possible that this type is designed for paints based on white spirit or water based. By the way, when communicating with colleagues who also use nitro paints, it was not possible to collect clear statistics. Some experienced shrinkage effects, others did not. It is quite possible that this depends on the area being puttied, the thickness of the layer and the type of solvent used to thin the paint. So, when working, you need to be careful so that there are no unpleasant surprises after painting. It is worth adding that car putties can be used as putties for models. Fortunately, they are now large selection, there are also some pretty good one-component ones. To be honest, I haven’t used these myself, but judging by the reviews of my colleagues, some very successfully use automotive chemistry of this type for modeling.
The second type includes two-component putties, consisting of the mass itself and a hardener. The preparation of the working composition occurs by mixing the components in the required proportions. This must be done very carefully, having first read the instructions. For example, let's take a two-component putty for Tamiya models.
It consists of two identical plates and is mixed in a 1:1 ratio.
You can mix its components by mashing it with your fingers. After this, you get this sand-colored mass.
The working mass is quite hard and cannot be applied with spatulas by spreading it. She's good at closing up large gaps, you can also sculpt something from it. This is what the putty parts of An-12 engines look like. It is better to stuff the working compound into the cracks with a spatula dipped in water.
And here, on the F-86F Saber model from Academy, I built up the tail section by sculpting.
And this is what the installed and fixed stern tubes look like on the S-100 radio-controlled torpedo boat.
As in the case of one-component putties for models, automotive chemicals can also be used here. Good results obtained by using Body Soft automotive putty.
It also consists of two components and is mixed in a ratio of 1:100 (100 parts of putty are taken for one part of hardener). Increasing the amount of hardener reduces the curing time. This putty has a pungent odor, and it is better to work with it in a well-ventilated area. It is easily applied with a spatula by spreading. Using Body Soft, I sealed the sink marks on the An-12 model.
Separately, it is worth noting the homemade putty, based on glue for models and sprue. Today, even with a huge selection of specialized chemistry, I personally have not refused it. I use it to repair small scratches, chips, and sink marks. Over many years of using it, I came up with my own recipe. To prepare homemade putty for models, I use: dichloroethane, white polystyrene (trimmings polystyrene sheet or sprues from Revell ship models), and as a filler I use a little talcum powder to prevent bubbles.
To do this, you can use regular glue for models, for example, from the Zvezda company, instead of dichloroethane, but I liked working with it more, although this substance is more toxic. Depending on the thickness of the layer, the part can be processed in about a day.
In conclusion, I want to say, like everything in modeling, the putty process is creative and requires experimentation. What and how to use is determined empirically; there are only basic recommendations. There is no one universal putty for models, it is better to use several different types, most suitable for their tasks and operations.
