Can I thin out Valspar(tractor supply)primer for the spray gun, and what would be the right mix. I painted the truck with a good paintabout 5 yrs. ago. Paint job failled due to MY bad primming (damp days with windows open and ex. fan pulling in damp air. Now I'm looking for a decent paint job for my farm truck, it's just a toy and I'm getting a little too gray and don't want to use the ex. stuff. Thanks, Paul
