first time installing pans and quarters questions

just quarter skins. what is the best brand epoxy primer you guys have used? This is just something I want to do once and never again :) I am only 22 so this needs to last until it gets passed on atleast :) would epoxy primer on the new stuff and por on the existing stuff work ok? what top coat could i use then that would adhere to them both? i guess with the por15 you have to spray primer on it while its still wet to get paint to ever stick? sorry with the million questions guys! i have been reading forums and just want to make sure I have everything straight. Underneath I am thinking I am going to go with the por15 the whole way as I have talked to a few people who say it is great. any opinions on that vs undercoating or just painting? again, thanks guys for the help!!!!