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Interesting epoxy test.

Just fyi, you should plan to have enough time to do two coats over your bodywork, then scuff and apply two more coats the next morning. The second session will hide the areas where the filler has absorbed the epoxy and give the panel a much nicer, more uniform look.
I'm talking about before you are ready to drive it again after the repair. You did say you were going to continue to drive it during the process, right? You will see what I'm talking about when you shoot the primer over metal and filler. Unless you want it to look really ugly, you'll need those two more coats to even it out.