Just becareful when painting panels off the car. Put them in relation to each other so the texture is the same. If you do the hood, the hood should be laid flat, not standing up.. the doors, not flat.. standing up.. so when you put the doors on the truck next to the bed - the texture will match the bed...
This is good advice, but it has another reason behind it. If you spray metallics or pearl metallics, they have a flop agent in them that aligns certain pigment moleculesn by gravity in the matrix. If you have the fenders laying down flat, the doors standing up, and the bed standing on one end, they may look all great laying around the shop. But once put together, it will look like you painted it four different shades.
Look around at some of the cars that noobs have sprayed with "chameleon" colors like DuPont's Aubergine. some of those were sprayed apart, and they were not put on stands in the proper "on car orientation" The results were that every body panel that was painted in an odd position, reflected sun differently, and as such, different panels transitioned colors that did not match the adjacent panel. Looks horrible. I've seen a few ricers around here like that. One panel is turning from say, red to blue as you stand with the sun angled down the side, but the door next to it is doing something opposite.
This is more reason to orient the parts as they set on the car more than just the finish. That can be corrected with a cut and buff anyway. The gravity alignment of the pigment molecules can't be changed once the paint "cures" or, the solvents have evaporated, the orientation is set.
