Trouble Spraying High Build Primer

Metal temp and air temp are two different things. It would have to be over 100 degrees air temp to get your metal temp that high. There is nothing wrong with reducing a high build primer. You will thin the material enough to make it spray nicely and you will notice it "soaking" into sand scratches and body filler. I would much prefer this than slapping a thick film over heavy scratches that are only bridging these scratches and pin holes (they will return). Secondly if you over reduce it you will just end up with more sprayable material... just add additional coats to get your mil thickness... Also when you over reduce primer it will lay down much better which makes sanding easier. It gets a bit annoying to sand all of the style lines and edges that have massive orange peel.. Make it easy on yourself.