I use as thick a blade as my saw can comfortably handle (which on my 14" grizzly is a 3/8" blade). There's a handful of nice wood only blades on the market, I was using the woodslicer or something like that from highland woodworking. What you can't do with a normal blade is cut glass. It will dull your blade immediately. I got around that for awhile by dedicating one blade to cutting glass, and a nice one for wood only. If you plan on cutting a lot of glass or working with g10, then you'll want a carbide tipped blade eventually (and many folks use them even if they're only cutting hardwoods as the blades last a lot longer and cut much nicer), though they're about 3x the cost of a normal blade (about $150 for a nice lenox blade).
I use the preval sprayer with buffalo hide and do the 50/50 mix that they recommend with no issues. I like the texture of a sprayed finish, so i keep it pretty thick. If it's too thick, then follow the directions for adding thinner (you have to let the epoxy catalyze for awhile before adding it). If your sprayer isn't working, the straw/tube might be plugged from a previous use or some other issue, maybe try a new can or straw.