I'm having xpel ultimate applied to the front of my MS this Friday. I also want to have cquartz applied to the vehicle as well. I spoke with the guy who I plan on having apply the cquartz and he said he is hesitant to apply the cquartz on top of the xpel due to fear of "yellowing". 1. Is this something I should be concerned about? 2. If it is, would it look strange/noticeable to have just xpel on the hood and cquartz everywhere else? Thanks for any input.