Bought this product to make a simple repair to a pair of prescription sunglasses, the repair I made was IDENTICAL to the repair example on the box the glue came in, First attempt broke right away, and I thought, well maybe I didnt clean or prepare the 2 surfaces good enough, so I re-prepped this time being double thorough...it seemed to be holding pretty good....then I went on a walk on the beach....within 10 minutes the glue had deteriorated (from heat or from sunlight?) and the glue had a bendy stretchy pliability to it.....this product is just another "as seen on tv" rip off....plain old super glue fixed my glasses....thanks for the horrible failure bondick!!