hey thanks all, this is awesome,  my first time posting.

i have since been looking into two products for this job. one is thoroseals plastermix, the other is conproco’s  conpro-plastermix.  probably the same thing for the most part. each is designed for coating foundations below grade, lining water tanks etc. they’re made to withstand hydro-static pressure to the max.  i can’t see a problem using these but if anyone can,  let me know please.

anyone interested can check them out at   www.chargar.com ,  or thoroseal site, or conproco site

also check out the backissue of FH #127, the first annual issue on kitchens and baths,  for great design and pics similar to the shower i’m designing.