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Filling small pinholes

Quick Question: What’s the best material to fill small pinholes in resin castings? Will NitroStan work?
                   
-Bob Dickinson
via email


Ken: Short answer: yes. Longer answer:  just about any putty will work on resin, including modeler’s putty such as Tamiya, Squadron “Green” and “White,” or any other one-part putties found at the hobby shop.

Automotive putty like Bondo and Nitro-Stan will also work. Two-part polyester putty is my favorite for larger areas, but for pinholes you’ll be good to go with the one-part stuff.

The key is to clean the resin really well to get rid of oils and mold release agents that will potentially keep the putty from sticking properly.

One more thought, if the pinholes are super-small, you can fill them with super glue or automotive filler/primer dabbed on with a small brush.


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