Taillight questions

Last fall I noticed some water in the taillight of my 67 Dart. I pulled it apart and found where the water leaked past the gasket. I put a new gasket set in the taillights a few years ago. What is best to secure the gaskets to the housing? The tabs in the lens(where it screws to the housing)are stripped a little and don't seem to tighten as much as they should. Can I put a drop of crazy glue or something in each one? New lenses are out of the question at this time.
Thanks
Aaron