Anyone have any experience using an oil based primer with acrylic or urethane enamel top coat? Why? I use TCP Global and have always used their primer mated with their top coat, I only paint acrylic enamel or urethane enamel. Yesterday I went to my paint storage (old refridgerator) to use my next gallon of never opened primer, only to find that half of it had solidified..sucks. So I got to thinking about the conveinience of my local Tractor Supply, not to mention the low cost.