retro fitting pinch weld to old camp trailer

You will need a lip to mount the pinch weld compared to the flat mounting surface for tape.

Some aluminium angle pop rivetted on is the easiest material to work with in the back yard ... or get a lip welded to the existing body.

Hinges/Locks will probably need some relocating as the mating surface distances will change.

I fitted pinch weld seal to my camper I just renewed what was already existing but the existing seal looked like it had been shot with a shot gun. What a difference it made.
It's fantastic gear not that expensive I didn't think.
I got mine from Fitch the rubber man, a good web site to see all the different types and shapes.

Cheers Scoof . :-)