So, PVA primter is labeled "contractor grade" and is about half the cost. What's the catch.
Apparently, it's pretty poor stuff, although contractors seem to have no heasitation about using it for new drywall. "PVA primer is a primer made with a polyvinyl acetate binder resin, the way paints were made in the beginning some 40 years ago. They are the cheaper grades of primer as PVA resin like the ones I used to sell are plentiful and therefore cheap.". That quote was from this forum thread, the usual dark echo chamber full of dummies with a few snarky schmott guys:
http://www.diychatroom.com/f4/pva-primer-vs-tinted-primer-90226/
Here's a forum where the contractors are like "PVA fine for new drywall":
http://www.doityourself.com/forum/walls-ceilings/179671-rookie-kilz-vs-pva-primer.html.
However, many folks seem to have no heasitation to comparing PVA to Elmer's Glue.
