I also prefer separate containers as it's almost impossible to keep the "all in one" style equal in the 'tubes', and it can be a pain to get them to come out at all after some use. This seems to cure to a good hardness, but I've found that with some plastics I have to hold the items together for closer to 10 minutes for it to work. Although, not nearly as bad as the ACE Hardware brand which claims to be 5 minutes, but is more like half an hour.