ORIGINAL: Ed Cregger
Like you, I'm a water based poly fan too.
I used to use K&B Super Poxy clear paint for applying fibeglass cloth, but we all know what happened to that some years ago.
I'm glad I switched to water based poly. I haven't had a warping problem yet. I do, however, like the idea of applying a sanding sealer coat. That would prevent any possibility of warping.
Ed Cregger
Ed,
Klass Kote is supposed to be the same formulation as the old K&B epoxy paint.