My interior fabric are exposed to the elements! I experience alot of sun exposure due to the
hatches and windows, a general high level of heat and humidity in the cabin, and more than the occasional rain and other water while sailing. I use the upholstery fabric from sunbrella and that is quite resistant to abrasion and, unlike natural fabrics, is highly resistant to mold/mildew. Its also somewhat water resistant. Im sure a drier cabin would be fine with Jim''s or Don''s or Karen''s choice of fabrics.