How smooth is the skin on your hands? If they arent sand a few of your finger tips and wash with soap then dry them. Now feel every bond area that is showing. Im thinking its just raised enough to show through not level with surrounding area. I know it may sound weird to do but feeling it will give better judgement. Also if you have magnigying headset wear it while feeling it if not use a magnifying glass.
Was it fully bonded where the middle was filled but the edging where it meets the surrounding area wasnt fully filled.
It might not have been fully 100% dry before first coating was applied. Idk as I wasnt there lol only throwing things out.