Back in the good old days I brushed on a couple of coats of K&B clear with the satin catalyst. When I finally ran out of my stock of K&B I had to find another method.

So like BOBH, I use the small foam roller to apply 2 coats of West Systems 105 epoxy. Then sand and prime. I'll be glassing my YA F-15 with this method in the next few weeks.