To avoid the problem which RCKen stated, use hardware store Denatured Alcohol, or better yet Acetone.

Mix up 30 min epoxy WELL, then add about 1/3 Alcohol or Acetone to thin it down a bit. Mix it again WELL.

Since you are applying a thing layer to the rather large evaporative surface ( and this is not meant to bear a load ) the more slightly diluted mix tends does tend to dry fairly well.


Note that some Epoxies now come mixed with some form of "binder", probably in an attempt to lower the manufacturer's cost.

The Great Planes Epoxy is the most egregious of these. The resin has a "gritty" feel or texture to it, on every bottle I've opened.

Strangely the Tower Hobbies epoxy ( GP and TH epoxies are both sold by Tower ) does not have this problem.

The GP epoxy makes a very poor fuel proofer thanks to the added substances. It dries poorly when mixed with 50% alcohol.

The TH and other similiar mixes seem to fare MUCH better.