Got a motorhome i built, and for the shower i bought some vinyl faced ply to make the walls out of, this needed silicone sealant at the joins, which i covered with some of that bath seal on a roll.
problem is we get wide temperature fluctuations in the van, today is was 35 degrees in there, and hence the tape and sealant likes to pull away from the joints every so often, and i'm sure the vibration and inevitable movement from driving over englands silky smooth (not) roads dosent help.
been told there's some shower boards that have some special interlocking seam kit to make a totally waterproof shower cubicle, and B&Q&Q&Q do it,
but searching their crappy site, but getting nowhere.
anyone know of this stuff? i'm imaging it's a plastic sheet type material with some joiners for the corners, i have 3 x 90 degree corners and 2 x 45 degree corners... hoping for the 45 degree corners i can score the back and bend it), it's a square tray with a corner missing to make an angle where the shower gear goes, it's not a large shower cubicle, prolly a meter and a half square, this is in a motorhome... some of the factory built ones have what looks like a foot square cubicle... not designed to be used, just to bump the price up by boasting a shower on the spec list :)