I agree that UPOL stuff is really good. I would be happy to try their primer, but I like the G2 so much, I am hesitant to try anything else. I did a lot of work to a badly damaged plastic front bumper facia on a car I was flipping once, and I needed to do a lot of filler work on it. U wound up using a UPOL flexible filler designed exactly for what I needed. It worked very well, sanded nicely and the resulting repairs looked great And tou are right; name brand products are not cheap, but you get what you pay for.