I am new to compressors and am looking at a Husky right now that I can get a good deal on. I will be using it for pretty much anything and everything automotive related from an HVLP spray gun to grinders and impact wrenches. It is VERY unlikely that more than one tool would be operated at any...
Do EXACTLY what the instructions say to do. If adding water would make the primer stick better, don't you think the company would have added it in the beginning? Top quality paint is formulated to stick as best as possible how it is.