I've done the paint protection film for one of my bikes. Most tubes only require rectangles, but for non-easy geometries such as seat tube cutouts, I formed taped-together sheets of paper around the tubes, traced the outlines with a pencil, scanned the paper, traced it in Rhino (Illustrator or whatever software you would prefer would also work of course - I'm just most comfortable in Rhino), printed it out, glued it to the backing of the film, cut it out with scissors, and then applied it to the frame with soapy water.
It was a bit of work but worth it. I for some reason did every tube other than the top tube, which now has a light scuff on it (non-drive-side, thankfully). I am of course regretting this, so I'll be doing the top tube as well when time permits.
The hardest part may be sourcing the film. I have a friend who is a car wrapper, and he gave me some offcuts.
I've done the paint protection film for one of my bikes. Most tubes only require rectangles, but for non-easy geometries such as seat tube cutouts, I formed taped-together sheets of paper around the tubes, traced the outlines with a pencil, scanned the paper, traced it in Rhino (Illustrator or whatever software you would prefer would also work of course - I'm just most comfortable in Rhino), printed it out, glued it to the backing of the film, cut it out with scissors, and then applied it to the frame with soapy water.
It was a bit of work but worth it. I for some reason did every tube other than the top tube, which now has a light scuff on it (non-drive-side, thankfully). I am of course regretting this, so I'll be doing the top tube as well when time permits.
The hardest part may be sourcing the film. I have a friend who is a car wrapper, and he gave me some offcuts.