I bought this product 3 years ago to fix a tear in the neoprene portion of my cabelas 5mm hip waders. I fixed the hole once which did the trick. Once it dries, it becomes flexible and it did not crack or tear. It's like it becomes part of the neoprene. It also worked on the rubber boot portion of the wader when the rubber developed cracks. You just have to lightly sand the area of the boot with fine sandpaper to give the aquaseal something to adhere to. This product got me 2 more years out of a pair of hip waders that I would normally have thrown away. If the aquaseal formula did not change, you will be satisfied with it.
I used this for the first time august 09 in Colorado. the regular urethane sealer wasnt available. this worked to seal the leak super fast in sun light as advertised. however it hardened in the sealed tube with the cap on overnight. I cut the bottom of the tube the next day to get the little remaining sealer out for another small leak. So far so good. I will pass final judgement next summer when I go back to Colorado.