Have done all of mine, do it as a matter of course. TT is the way to go for me, as Clays guide says you have to know how to use a spray can, apparently some people don't!!
I don't like the idea of tape or Mylar, I feel it could exacerbate the problem eventually.
If you have a bit of lifting happening don't forget to do a light tack coat first at a distance, as the aerosol spray can blow bits off.
Have a look at your DQ glass mate, I TT'd that with the cling wrap method it was in danger of falling apart completely.
If you want to get the TT cheaper PM or ring me and I'll give you a contact.
Cheers,