When I first used POR 15 they had only a few products. They now have a catalog full. Check it out at
www.por15.com and order a catalog. They have their own primer and body filler, ect. I have used their products with great success and have an order in now for products I have not tried, but considering their track record so far I am not at all worried. They have a primer that allows you to paint right over cured POR 15. It is worth investigating. You can buy small amounts of their products and that makes for a less expensive "try it out". I am not a body man, just a shade tree sort who finds out about things by "fooling around". I tried spray and brush and brush is best in my limited experience. They give complete instructions and have on line help. Ignore their instructions at your peril. (personal experience!) Ray