Mate do the whole car with Xpel and you wont regret it.
I had also few layers of CQuartz, and it really donesn't make much difference.
Xpel can be waxed if you wish, but it wont make much difference if you skip that part, as the wrap is so easy to maintenance that you wont believe it.
I had two track days sessions going bumper to bumper with rocks flying into my front bumper, and not a single mark can be seen on it so far.
Few weeks ago bloody garbage truck unparked into me, and it broke my rear right light and made a dent on bumper and few deep scratches on xpel wrap.
We removed the wrap, color was undamaged, heated the bumper to fix the dent, put a new xpel back on it, and it was like nothing happened.
Insurance covered everything and I didn't have to go through painful process of repainting of whole bumper at the stealership... and being without a car for weeks...
After damage:
After fixing it:
