I used 6 small tubes of Super Glue. It is chemically bonding the plastic, not using adhesive strength. The plastic for all intense purposes is now one single piece. That's why I wouldn't use any of that caulking stuff. Too much work, too messy, and inferior to a chemical weld. The rack I built was not designed to be dissassembled. It is small and light enough that one person can move it. It also fits through any door without a problem. I would not trust rescrewing into the plastic. I don't think that's a great idea and would not recommend it after working with the XPVC. Just my $.02...Thanks everyone!
Regards,
B