Work on the 1:35 SU-122 continues as I try to replace some missing parts thru squash casting. Squash casting is a technique to reproduce simple parts using a one-part mold. Here's a link to where I first learned about it.
For the 1:35 Tamiya SU-122 project, I realized that I had lost 2 viewport hatches for the tank destroyer's superstructure. Luckily though, I found one of the three hatches and decided to try squash casting replacement parts.For this attempt, I'll be using an A/B epoxy putty for both the mold and the replacement part. Depending on how it looks, I might try a different material later on such as glue-softened sprue plastic.
Anyway, I mix a batch of the putty together by kneading vigorously the resin and the hardener components and roll them into a cushion-like ball. After the colors had evened out to a neutral color, I split the blob into two and use the plastic hatch part I have left to create an impression on one side of the balled-up putty.
When the impression seemed deep enough, I gently removed the part, trying to avoid reshaping the putty blob and did the same thing to the next blob. These were then left overnight to cure.
The following morning, I kneaded a new batch of putty and the resulting mixture was pushed gently into the molds which had been earlier brushed with baby oil. these were left for around an hour to dry.
Reminder though. Do not let the material harden too much. This is so you can trim off the thicker parts of the casting while it is still a bit pliant and easy to work with. Later, I released the castings intact.
Next is to clean up each part thru sanding and grinding and to decide whether I should try another set with a different material or if these parts would suffice. More soon.
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