Spraying with rattlecans-amount needed?

I used about half a can on my forks recently (using plastikote). Nice finish, for about 1 day, rattle-canning will never come close to powdercoating!

However Dov makes life a lot easier now - superb quality painting, really cheap. He once sprayed a custom frame for Cavendish! Look him up.

I'm from Norway, otherwise I'd definitely look him up or go to Armourex..!
1 day?? I thought, with several coats, then several coats of clear, it should hold for a while!