A freind of mine who restores cars for a living, and most of are VERY hi end, wants me to use this k36 primer. This stuff is $260 for it and the hardener, !!!!!!!!! He says there is no shrinkage, I am trying to do a very nice DRIVER, not a show car. I am trying to justify spending this much on this primer as opposed to average primer surfacer that I have used before. What you guys think? Anyone else ever use it and can it be justified?