RE: West Systems epoxy
I've used the 105/206 combo with the metering pumps for years also,, never had a bad batch,, I use drug store rubbing alcohol to thin it when I'm using lighter cloth if need be,, also never a problem.
Sure you'll have to do some sanding,, that's just how it is
Avaiojet
If you like Poly,, that's great,, I gave up on it years ago,, just to volatile IMO I found it way easier to mix up a slow or hot batch,, epoxy is way more consistent as far a pot time goes