Has anyone layered UPGP on top of OS? I tried it on a friends SUV the other day and I don't know how long its going to last. I figured since I'm layering a sealant on top of a sealant that it would be okay but I don't know how finiky UPGP is. I did notice however that it was beading up better with both layered than with just OS. It had started raining about 3-4 hours later and walked outside to check it out. Now since it didn't have time to cure I think my test will be ruined. So does anyone have any knowledge about this? Has someone done this? Thanks guys