Will Liquid Plumber Foaming Pipe Snake corrode the drain seal on my bathtub?
I think the answer is going to be "it depends on what that rubbery seal is actually made of" -- here's the quote from the Liquid Plumbr FAQ --


  However, we do not recommend using clog removers in rubber pipes. The products may damage rubber.


Is the part with the rubber seal removable? If so, remove it before you use the liquid plumbr.