Thinning Epoxy...
Don't necessarily know if this is the best method or not, but I used 30 minute epoxy. My LHS sells epoxy brushes, 5 or 10 for a buck. They are use once and throw away. I just add 91% Isopropyl (Rubbing alcohol) until the epoxy has the consistency of warm syrup. Then brush it on. Seems to work pretty well.