Need painter's help!!

[garthdader]

3 questions for the experts:

1) Do I really need a 400 dollar dryer/ dessicant system for air or is there a cheaper way to do it the right way, without too much expense?

2) I NEED to lay down a good coat of primer and sealer. I have a cheapo lowes gun and a gti millinnium. Devilbiss says that the GTI gun can shoot k-38 but I really dont want to use it for primer. Can I use the cheapo ( only a 1.5 nozzle) or should I get a gravity feed gun with a bigger nozzle?

3) What would be a good clearcoat choice for BC/CC system for a truck that might go on the trail once and a while with all the tree and brush. Is one clear tougher than another or do I just do additional coats?

THANKS!