Start with a wet foam brush, but not overly wet.  If you start with a dry brush you will end up with about a foot of goobered-up area until the brush gets wet and starts sliding smoothly.  Same applies to tipping out resin and varnish.  Good luck.

Wetting the brush for paint and varnish is right on.....but, amazingly, when you tip out epoxy it really works better with a dry foam brush. Come in on the surface with a light touch and moving at a moderate speed and then lift off gently. Even an hour or hour and a half after applying this works well to pop the little bubbles and their is only a very small residue left on your brush which can be blotted off with a clean rag dipped in alcohol so you can use the brush again.

                     DocChicago