We are often asked how to attain (or restore) a smooth, gloss finish to the surface of a casting made from a Crystal Clear™ urethane plastic, and offer the following buffing technique using progressively finer grit sand papers and sanding gels to improve surface finish.
Every casting surface is different. For surfaces that have severe imperfections, you may need to sand with coarse grit sandpaper prior to moving onto the finer grit grades. If this is the case, we suggest starting with 120 grit followed by 220 grit and then proceed to using finer grit grades.
We recommend the Novus™ brand Plastic Polish system to achieve a final glossy finish.
Important: Results may vary due to a number of variables such as configuration of the casting, quality of the original casting, etc. As a result, Smooth-On can not guaranty or warrant that the above procedure will work for everyone. A small test on a non-critical area of the casting or different casting will be an indicator of whether or not this procedure will work for you.