I'v decided to build a makeshift paint booth with 2X2's and plastic sheeting, the tent would be too tight for painting, I need a wider space, so I'm not crunched up agenst the walls, is it safe to put this on the grass? I want the best paint job I can paint myself, I have 2 siphon feed guns, that is what I will be using, 1 is a touch up gun, the other is a full size gun, where do I find tips for these? they both came with only 1, and I need a large tip for primer, I only got 1.4 ( I think ) tips now.