Well I went for it, bought a 600x400mm sheet of gloss.
My frame isn’t really brand new as it’s been built and ridden by journo’s, and photographed for at least one online seller. (cos my frame number is in the photos!)
Definitely go for gloss if your frame is shiny, I applied the logo sticker they sent and once in I realised it’s on Matt film, it’s much more visible.
I made templates from A3 paper, if you can tape it into place fairly snugly then you have a good chance of getting the film on bubble free. I had to reduce the side coverage on the top tube as I hadn’t realised how hydro formed and tapered it was, but the film formed over the square edges fairly easily and once squeegee’d it did not lift.
I was surprised how easy it was, did top of top tube, underside of downtube, almost full wrap of seat and chain stays, and the sides of a carbon fork. No bubbles that I can see. Got a bit left over so saving that for putting under the straps of stuff like frame bags.
Use a new Stanley blade, cut from the film side.