Without question, this is the toughest and strongest bonding UV resin available anywhere. Most other UV glues look great and seem to bond tightly at the tying bench, only to let you down on the water. Example - we tied dozens of saltwater brush flies with eyes glued on using another brand of UV glue. A few casts into the saltwater and the fly was missing the eyes - which happen to be the most crucial feature of a saltwater baitfish. With Pro UV Resin Thin Flex, simply coat the eye, stick it to the fiber, hit it with the UV light, and you have a permanent bond that will never break loose no matter how viciously the fish hits your fly. One bottle lasted me nearly a year of coating bodies on perdigons, gluing on saltwater eyes, and creating beautiful glossy heads on steelhead flies.