To fill very small air bubbles or deep scratches in resin castings I use spot putty available in automotive stores. That stuff is normally used to fill scratches in similar colored car finishes and is ready to use right out of the tube – no need to mix two components or anything. The material is curing very quickly and can be sanded to a very smooth surface. I chose the color red because it is easily visible on beige resin or grey primer.


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