Dont need a good gun for primer but i would recommend a gravity gun for thicker application, as for paint you get what you pay for, you can use upol high build primer which is cheaper and a good primer, but if you want a lasting finish i would use standox more expensive but you wont get the shrinkage over time. the best paint i have used is house of colour it paints much better and isnt alot more expensive and lasts. Only drawback is they dont do standard car colours