Hello, i would like to ask you if there is any way to get rid of micro bubbles that appears at pouring hole ? I am pouring lure with polyurethane resin. After all i am sanding it and even after sanding there are noticeable "craters" in place of pouring hole. There wouldn't be a problem, but when applying the final polyurethane clear coat (by diping) it leaves a rough surface. I attach a photo of a lure after sanding a pour