The problem I have noticed long term is with Sun exposure the VELCRO adhesive gets soft. I checked with VELCRO and they said VELCRO for Plastics handle higher temps. The solution is to increase the surface area so there is less pressure on the adhesive and VELCRO, adding the license plate increases the weight on the Grill Cover.
I used 3M Dual lock fasteners to attach sunscreen material to aluminum window frames with no issues for over 3 years in Phoenix. You need the VHB adhesive. I only ran my grill covers in Phoenix for 4-5 months or so a year with no issues. Also, obviously the tape and one part of the tab remained on the car year round.
Edited by Plus 3 Golfer, 11 February 2017 - 10:14 PM.