I need to trim out a couple of windows in bathrooms, and both are small and right in the wall with the tub surround (and tile for the second one). I was thinking that I'd like to do the trim in plastic - maybe vinyl if I could find the stock. For each bathroom I only need bright white, but I don't know how well painting would work. The trim in both needs to be water tight (or at least strongly resistant), and custom routed/shaped.
Love some advice on materials in particular. I have used an off the shelf vinyl trim previously and it sucked - I need solid stock of some kind that I can route to fit. I was thinking offcuts of corian might work. Not sure if I can just order small enough pieces, or maybe find some offcuts somewhere (most places seem to get them fabricated to fit outside of the province, but again, helpfull suggestions on sourcing are welcome!).
I also thought UHMW might work, but the price is pretty high (3/4"x4"x2' is $20). Price is certainly a concern here. Also not sure how it might paint.
Certainly willing to consider traditional wood too, but would need some advice on how to make it really water resistant. Especially in the nooks and crannies. The idea with plastic/vinyl is that when glued together the seal would be pretty water proof.