+x MarkMK - 12/17/2019 7:11:14 AMIf your part has been made without an in-mould coating (like EC's GC50) and you weren't bargaining on having it clear coated afterwards, you will lose any gloss if you attempt to sand the bare epoxy. The depth of resin on an infused part is just too shallow. EC's XCR coating resin would, ordinarily, be a good resin to use on repairs to epoxy such as the one mentioned, but you'll likely need to think about having the part sprayed afterwards if you need an overall gloss finish. Using a product like GC50 does allow for light sanding a polishing, as it adds an additional gel coat layer to the finished part