I found out that if you can warm the item or area, epoxy will spread thinner. Use a heat gun or even a hair dryer and get your compartment warmed up nicely, the epoxy will brush out easier. I use a plumbers acid brush that I have cut the bristles down to have stiff bristles. Heated, it will setup quicker. If I'm doing an area like a tank compartment, I'll use two hour epoxy to get some extra time. With alcohol or acetone, you're really changing the chemistry while heat doesn't change it that much.