Forget the enamels. I am looking at perhaps 200 tins of the stuff. I am going to keep the odd shade fot nav lights etc but not large areas. Like you I brush paint and now use acrylic paints only. As has been said I use Klear and Humbrol Spray Varnishs, I use Grey primer from Halfords and large areas I use rattle cans. I always use sheets of plasticard for testing first never something that has been prepainted. Working on the premise that the model is new and unpainted and I don't want to confuse the issue as how the finish would look.Last tip never hurry it and don't paint when you are tired. Good Luck and Happy Modelling!