As
@fguki says, powder way cheaper.
My guy and girls use a 3 coat system...( they blast first with appropriate media) then anti rust primer, polyester powder, followed by clear powder over. They do all the taping up and bunging up too.
Cost is between £60 and £100 ex vat for basic ral colours depending on topcoat ( flat, gloss, sparkle) etc.
Also, remember not all powder is the same, there are different types and its come on a loooong way from the bloke down the road doing gates !
You can pay more, i did a fade with prismatic illusion, colour changing metalic powder and clear top. Expensive powder and long process, but still only £140.