First off, I`ve learned a lot reading this forum regarding performance of different products. The thread by budgetplan really is a great reference for real world performance of various coatings. After reading through that thread, I decided the switch from the cquartz classic that I have used in the past to 22ple hpc. As stated by many, this was REALLY easy to use and the initial results look great. So far I have two coats put on my truck. I still have about 15 ml left over, and I was wondering what, if anything, would be gained by using the leftover product to put on a third layer?