Mine is in drive way 24/7 never covered 2016 Thor axis. Decals are perfect no discoloring at all we camp everywhere mostly fl ga al miss. So I don’t have a clue except I wax my unit twice a year with past wax all over including decals. Turtle paste wax in I think yellow can. Paste wax put on by hand and taken off by hand. Takes about a week. I’m 74 years old. I do it by myself with music playing. Just take your time make sure clean before waxing. O I wash it twice a month by hand also. Don’t need a gym membership