Warning! Today I tried the Radians Custom Molded Earplug Kit. I followed the instructions completely. After carefully mixing the two parts as directed I carefully pressed the mixture into my ear. After a 1 hour wait (not the 10 minutes recommended)the gooey mixture was exactly the same as when inserted - a gooey sticky mess. There was no hardening at all. Let me tell you trying to get that gooey mess out of your ear is VERY DIFFICULT! Nothing like when is has hardened as it is supposed to. In fact in is literally impossible to completely remove it. I tried for a couple hours and even tried washing out my ear with a syringe. I did get most if it out but there is still a sticky coating of the stuff in my ear canal which will have to just slowly come out through the normal clearing of ear wax. I STRONGLY recommend that if you want to try this product you MUST try a small portion of the contents as a test plug out side your ear first. I would never use this product again without proving that there really was the correct combination of plastic and hardener that would successfully work outside my ear first. This need to be put in the instructions on the package from the manufacturer.