And if you don't seal them.. clear coat.. Xpel.. or otherwise.. in 30-45 days you'll be noticing a yellowish tint again.. I actually started with not knowing what I was doing and using some wore out 800 grit.. made them decent.. plastic polish helped.. and the turtle wax headlight kit kinda finished them off to a nice polish.. Xpel covers which were a PITA and look like crap up close has kept them clear.. "reposition as needed" ended up pulling adhesive from the plastic..and those small water pockets have yet to disappear. Have some of the cheap tinted ones from Ebay to try out next.