I've got a Prijon touring kayak made of HTP; all surfaces have some kind of
grainy texture and the BCU sticker tends to come off after a while.

(Certain NG trolls will now probably comment 'BCU stickers that don't stick,
typical ...').

I think it may be 'the boat's fault' for once but it really isn't great
because of lockkeepers and environment agency boat checking for these things
a lot.

Short of duct taping on a laminated thingy, is there any simple way of
prepping / keying the boat surface that has done the trick for others?