Ripoff, this adhesive does not even deserve a star: for starters, I had to replace the little lamp 2 CR2016 batteries purchased blister because the lamp emitted a feeble light UV. After replacement (at my expense) of the two batteries the lamp working properly and was finally cure the resin. After spending a good hour to repair the branch of my headphones (resin application, cure with UV lamp, grind some bumps) I thought I had made a good discovery with this glue. Although the resin is very hard (test with a cutter tip) I waited a good hour before handling the headphones. After an hour, simply take the helmet in hand, without even manipulate, the branch broke repaired in the same place: this resin has no grip on most surfaces, even though degreased (j ' did more tests) (I also well degreased plastic branches of headphones before putting glue, my hands were washed and I was wearing surgical gloves). I then managed to take off the resin of different plastic parts without any special effort, with the tip of my nails. I think this poor quality resin (friable and brittle after curing) may join as a porous support (and again, we must see how hard it could join since it is friable). Except in very rare cases (reshape a small piece of plastic or other material on a decorative object that can never manipulate), I do not see what this VERY expensive resin (5g to +/- 7 = +/- 1400 kg) may serve (at least not glue). The reader of this commentary, I said that I am a consumer who has been rolled and not an employee of a competing firm paid to post a negative comment!