meh...I'm not going to argue other than to say I'm a bit of a stickler when it comes to my cars' paint and make it a habit to give it a thorough inspection when it's grooming day at the zoo and (un)fortunately often see new imperfections/marks/etc. Moreover there's a 10 year warranty against yellowing with XPEL that they do NOT want to have to pay out on I am sure (having to cover both the material and warranty). Yellowing definitely was a problem with earlier iterations of the PPF and may still be so with other brands, but best I can tell XPEL is not one of them. HTH