Oh, Them Tiny Bubbles . . .!
By David  N. Goodchild

The same freind mentioned in Spraying Epoxy on this site, G.B. Fisher, has also discovered another trick which is of help to any of us who brush or roller epoxy as a laminating or sealing coat. He was having trouble with bubbles on the surface of the epoxy he is laying on the body of his 1950 Willies Panel Delivery, as a restorative surface prior to painting. He found that if he sprayed a thin coat of Denatured Alchohol on the surface of the newly laid down epoxy, it eliminated the bubbles! Good idea!

Larry Steeves of Raka Marine Epoxies, (the originator of the above tip) has added the following:

"Concerning bubbles on a coated surface.  Many people who use our thick clear coat epoxy for bartops etc. and will get bubbles on the surface which may not break before the epoxy sets up.  A couple of tricks to pop them is to pass a propane flame a few inches above the surface back and forth which will pop them.  Flame is always dangerous so we recommend using your plastic spray bottle filled with denatured alcohol and set to to a fine atomization.  A light mist on the epoxy surface will pop the bubbles and the alcohol will soon dry off the surface and leave no adverse effects. This will work on regular epoxies also but may cause running or sagging of the epoxy on less than horizontal surfaces."

Now you have the whole story!