I have a strange issue applying polyurethane with my HVLP sprayer. When I spray, the surface looks smooth and wet and level. Soon after it begins to dry, I see small circles where it appears the finish is drying and lower than the remaining wet finish. The circles, although subtle, are visible in the dried finish. It looks as if it’s some sort of chemical reaction to dust, possibly pushing the finish away from the dust or perhaps the dust absorbing the finish, although the size of the circle looks larger than some invisible dust would be capable of absorbing that much finish.
Anyone familiar with this issue and a fix? I have one more coat and hope to resolve this for the last coat.