I am trying to find a sheet material for use as shower/tub walls and have been considering Formica. On the Internet I have found some people/contractors have used it for this purpose but can't find any really good technical info. On the Formica site I could not find anything and did submit a question. Does anyone have any experience or comments about this? I was planning on three flat sheets and caulking the seams rather than trying to bend it. If I did this should I laminate to mold-resistant sheetrock (bathroom grade) or would a plywood backer be better?

I have seen hardboard in the home centers with simulated tile patterns, but it only comes in 4 x 8 sheets and it makes it difficult to make a surround for a conventional 30" x 60" bathtub as I would like a 5'x5' sheet on the main wall, and want to minimize seams.

Any comments as to feasibility and installation would be appreciated.