Use at least 30 minute epoxy. The alcohol is a "reducer". It makes the epoxy thinner. The object with any reducer, either paint or epoxy, is to get the stuff to the viscosity that you want. Then, it is the job of the reducer to disappear before the paint or epoxy sets up. In the case of the epoxy, the alcohol need enough time to evaprorte before the epoxy sets, or you wind up with a rubbery mess.

Do NOT use rubbing alcohol. It is normally 30% water and the water will not evaporate fast enough. Use either pure isopropyl alcohol or denatured (ethyl) alcohol. I mix it one part epoxy, one part hardner, one part alcohol. This is not real important, as long as the epoxy is slow enough setting to let the alcohol evaporate. Acid tinning brushes work well. If you are doing inside the plane, you can even bend them 90 degrees to get areas that are tough to reach.

You can wipe of the excess with wadded up toilet paper to get rid of any extra weight. No strength is involved so any excess is.. well.. excess.

You can also use watered down aliphatic resin (YELLOW wood glue). It is fuel proof when it dries. It goes on easy and weighs less when it is cured.

JR