You guys should try this product made by ML Campbell called Krystal. it's very a water resistant conversion varnish that is seriously user friendly, and holds up great in the feild.
you still need to get your air:material mixture going right and learn to do a couple light coats, instead one wet coat..... but when it comes time to sand this stuff, it's excellent. MUCH easier to handle than fullerplast.
you can spray 3 coats and touch sand this stuff or use steel wool on it in 30 minutes time. start to finish you can do a bow in two hours easily, and be shooting it.
Didn't you switch to Krystal Marty?