epoxy thinning

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You can heat epoxy in a microwave for about 15-20 seconds, and that will thin it, but beware because the cure time is GREATLY reduced. It hardens up very fast after heating.
I use denatured alcohol, but a little thinning goes a long way. Beware, though, that thinning weakens the epoxy bond.

You can use alcohols for thinning epoxy. But this can cause them to become brittle after they cure. Try using a little isopropanol (not 70% like rubbing alcohol, but the anhydrous from Tamaya paint thinner). You might want to experiment around with how much to use and how thin the Epoxy gets and how brittle it cures when diluted. You could always reduce the amount of hardener to get a less brittle product when cured.

Bruce S. Levison, NAR #69055
I know this probably isn't the answer your looking for, but it's much easier to start with thin epoxy (I recommend West Systems), and thicken it as necessary for the required application.