I know I've seen the answer for this before, and I'm almost sure it's "stop worrying, it's OK".
Do you absolutely positively need a top coat before you go fly a slimer that's painted with dope? How much trouble will I cause myself if I go flying -- with 10% nitro -- with just a few coats of clear over the colored paint?
Specifically, I expect to have a scale plane that has a few coats of clear dope over the color for the NW Regionals, but to which I may want to add some finishing touches (like, more clear and sanding). I'm expecting that I won't want to put top coat on it yet, because it won't be done -- but the Regionals is the only Control Line Scale event of the year in the Pacific Northwest.
So, will I screw it up? Should I get some 5% nitro fuel or FAI fuel to be on the safe side? When I do put more clear on it, is there anything I should do beyond a Really Good rubdown with denatured alcohol before I paint it some more?