Try to answer your questions 1) NO 2) NO 3) NO Silicone or any other caulking material is not required on a shower strainer. Yes it is a quick fix to your problem, but not a permanent solution. It sounds like you need a new shower strainer. If you have basic skills in plumbing repair, I'll try to walk you through it. The fiberglass pans are infamous for leaking, especially with ABS (black plastic pipe and PVC white plastic pipe)These pans actually "flex" over time, and cause strain on the drain line. There are many plastic strainers available to buy. You will need: 2" strainer, 2" slip coupling, or 2" Fernco band, ABS pipe cement (glue) Hopefully there is a straight section of piping underneath the strainer, if not u might have to buy some additional fittings. Cut out a section of pipe underneath and remove the old strainer. Make the new strainer onto the shower pan. Make sure to put plumber's putty underneath the flange of the strainer. Measure from the cut piece of straight pipe to the make-up of the strainer. This is your new section of pipe, that you will glue the other end to the coupling, and the inside of the strainer body. Please take note that if your shower trap is directly beneath, you might have to do this on a horizontal run of pipe, and re-install the trap. Another more costly solution, is to completely remove the fiberglass pan and install a wet bed for ceramic tile. Hope this helps some, Good luck!