I screwed up my trim tab bottom skin after priming it with EkoPrime. It sat in the corner for a couple months. Last night, I put it on top of some plywood on the floor, painted side up, and ground my foot into it as hard as I could for a few seconds. All I got was dust off my shoe, which brushed right off and left the smoke gray primer intact. I am officially impressed with this product.
Thanks for the tips on Jetflex WR. I'll have to call the nearest Sherwin Williams dealer and ask about it. I assume they can get it, it's just a question of stocking it. My major beef with Sherwin Williams, after building a house, is that they have too many different colors to choose from. That will probably turn into a problem earlier than anticipated with my plane. (Compare that with the Kitfox builder I know who is several years into the 'once I pick a color, I can fly it' phase.)