Rustoleum Clear Coat Problems
Not compatible. Among other things, Rustoleum is long oil (slow dry), and krylon clear is a fast dry. They probably wont bond correctly, too different.
Applying heavy coats of paint can slow the drying process, leaving the coating vulnerable to wrinkling, as well as other issues such as mud cracking, and orange peel. This is a common problem, and there are several reasons why it happens. In this post, well take a closer look at what causes spray paint to crackle, and well discuss some ways to avoid it.
After 24 hours, you can complete your project with a new, thin coat of spray paint. Be sure to follow the recoating instructions on the cans label for best results. Luckily, you can usually prevent spray paint from cracking, wrinkling or bubbling, and if it does happen, you can correct it.
I've had similar issues even out of the same can of spray paint -- paint an object, wait several days, try a second coat and the lifting can occur. There is something in the curing process that causes it to react adversely. Not a direct answer, but I'd make sure the primer and paint are compatible.
Observe intermediate and final flash off times. Do not wait too long after spraying the final coat of basecoat. (If a long wait is unavoidable you should sand the basecoat and respray).
Use the recommended hardener in the correct mixing ratio. Avoid any contamination of the basecoat before spraying the clear coat. I used Rustoleum clear coat over Metalspecks (which I discovered earlier the hard way that it's a laquer-based paint), and it worked fine.
I think the clear coat must be more laquer based, and spraying that over enamel will cause instant cracking. I had done the appropriate sanding over areas and laid the first tacky coats today of clear. Once I laid the first 3 light coats, as expected, all the dull areas I wet sanded blended and became glossy and consistent again.
I've had problems with Rustoleum doing the same thing as you described. Also, the nozzles clog often, and the nozzle doesn't clear by turning the can upside down and spraying until the paint is gone. Wrinkling is typically caused either by the previous coat (s) not being fully cured, or the clear coat layer being applied too thickly.
Wait for it to fully dry, sand out the wrinkles, then go back in with another couple light coats of color and then the clear coat again in thinner layers
