Paint timing seems to be problematic with me, so if I may, a question or two. When I shoot base, I have always understood the clear must go on after tack free, but before 18-24 hours has elapsed. If I wait several days or more, I need to sand, then reshoot the base, then apply clear. I have had issues with sanding base then clear. They just don't bond together well. Now for flake, I put on 3-4 coats, then 3-4 coats clear without flake. Then cure, sand, polish and re clear untill the desired surface shine is obtained.