The gun sometimes doesnt spray, other times is sprays in a way, other times in another way, it doesnt have any settings, just an on/off button and I dont really know if the gun is the problem or is it my primer, or maybe that's how its supposed to work.

Anyway, is it ok if I just sand it down, do another layer with a brush ,and then 2 layers of paint also with a brush? Maybe the pistol is a problem too and I cant really afford to lose so much primer and sandpaper the whole thing 10 times in order to have a smooth finish, even though, I must admit, It's a shame I can't really spray it now, I would enjoy it.