Read reviews for the ClearGuard adhesive by 3M as submitted by your fellow paddlers. All of the reviews are created and written by paddlers like you, so be sure to submit your own review and be part of the community!
The bad news:
ClearGuard is hard to buy. I think that 3M must want it installed by professional detailers; it is mostly used to protect hoods and fenders against rock chips. Therefore, I told prospective vendors that I was NOT applying it in that fashion (which requires a fair amount of skill to look good) but using it just to protect high-wear areas on a fiberglass kayak and at strap contact points on my truck. The first time I bought it I found a detailing shop that let me buy some scrap pieces. The second time, I contacted the distributor for my region and bought a 10' x 6" strip for $30. That was the minimum amount required (which I didn't mind because the stuff is so useful). Your results may vary, so ask nicely and be prepared to shell out some dough.
I highly recommend this product for the 3rd purpose above.