[esahlin]

I sprayed some single stage urethane black on an small underhood piece but forgot to add the urethane activator to the single stage when I sprayed it. I have since sanded it with 800 grit, and was wondering if its possible to leave it as is and clear coat over it? IOr should I just remove all the paint and start over?

[64r1]

soory but its best to start over

[BarryK]

64 is right, however if you can sand it, it is not a true urethane and must be an enamel want-a-be conversion.

So if that is the case you can leave what you have and it should be dead in a year or two without activator and will take about 6-9 months to totally cure, depending on color and outside exposure.

Either way you cannot spray a clear over it because it does not have an activator and even 10 years from now, any urethane or primer will have a 90% ++ chance of looking like you sprayed paint stripper on it.

[esahlin]

Thanks Barry and 64r1, Fortunately its not a big part and wont be too much trouble to strip.

Barry, since I dont know anything about paint what's an enamel want-a-be conversion? "however if you can sand it, it is not a true urethane and must be an enamel want-a-be conversion."

[BarryK]

Enamels will dry with or with out an activator, urethanes will not other then skimming and once in sun soften right up again.

Common with lower grade paints and that may or may not be the situation here.