Wally Body,
I've gone straight to epoxy after sandblasting as well and have had no problems. But when I mentioned that system to a couple body guys they said the blasting still leaves dirt and residue that the cleaner can remove. So after that I started with the wax/silicone cleaner. Haven't had problems either way...so far.
sevt_chevelle is right, go to a auto paint store and buy the cleaner by the gallon, much cheaper!
