Trying to save a buck and do it myself, I bought for $28 a bumper repair kit for the 02 Accord to fill in some big paint chips. There were four plastic packages all looking identical. I opened one. It said "Exact Mix". So did all the others. What does that mean to you? I knew Bondo needed a curing agent but I thought somehow that it was premixed in the sealed package.I wiped the area with the supplied tiny sponge, getting a sticky substance on my right hand that proved to be almost impossible to remove with everything from acetone and rubbing alcohol to olive oil, then smeared on the Bondo. 30 minutes later, it was still wet. Oh oh. I examined the packages more closely. Sure enough, one of the packages said hardener. I tore it open and smeared it on the already applied Bondo and waited. And waited. No dice. It never hardened. Apparently mixing it on the car doesn't work. Now the problem - how do I get the wet sticky black uncured Bondo off the bumper? It also rained this morning - hard.