If you live in a hot dry climate leave it alone, but epoxy gives excellent adhesion & you can apply fillers over the epoxy without sanding within a reasonable amount of time if it sets over 36 hr's just dust a fresh coat on.
Mike
I'm in a dry climate here, some rain, but in the valley it's pretty dry and - murder on your skin though. But they have lacquer epoxy primer also. I might get that next when I get my refill and this car is in the garage now