 How do I fix bare spots? Bare spots, craters, divots, fish eyes. All these things are a result of the art resin resisting something that's on the surface. Sometimes it's because of the use of silicone oil. Sometimes it can be just hand lotion that transferred onto the surface that's repelling the art resin. At any rate, to fix a bare area, simply sand down your piece with 80 grit sandpaper, clear off the sanding residue, and then pour another well-measured, well-mixed coat of art resin on top. It's good to go.