Thanks Jonathan, I had seen the beta strip and the only reason I did not take it further was that I have painted my hull, and gluing to paint is not a great idea. I also thought that the glue might not be a permanent solution.
But it occurs to me that I could carefully abrade paint away from a strip and glue the beta strip to the GRP, then paint over it; colour matched bumpers are a cost extra option on cars but I could add them for free!
Alternatively, from your experience, would you say that I could screw the plastic to the hull (perhaps as well as gluing it) as a really certain way to fix the strip?
Although I am unlikely to be scrutinised, I wonder whether the bands being in plastic breaks the rule 11.4 (b) which says that the band should be in corrosion resistant metal? One for Bob perhaps.