FWIW I only used Krylon once a long time ago - it got soft and rubbed off.

I've used Rustoleum over Monokote, laminating film, and Ultracote (recently) with excellent results for over twenty years. I wipe the film down with lacquer thinner, try to spray light coats (I use cans straight), give light colored base colors plenty of drying time before I mask for the darker trim colors.

I used to clear coat with their "Clear Sealer" but I can't find it any more. Regular "Clear Enamel" works OK but it yellows a little over white. I have used up to 50% nitro fuel (on racers) with no softening - but it has to be cured thoroughly "for best results".