This high performance polyurethane by 3M marine 5200 becomes tack free in one hour and fully cured in 24 hours. The seal is extremely strong and retains its strength above or below the water line. Stays flexible — can be used to adhere patches, hardware and sacrificial cover material to sailcloth. 5200 is a waterproof adhesive.
Master sailmaker Dan Neri in his book "The Complete Guide to Sail Care & Repair " recommends "5200" throughout the book for sail repair.
