I have tried the PVC. Too soft and dents like crazy. Removed it.
I currently have starboard trim. The foot rail is 3/4" thick and is excellent so far. No noticable warping to a point where I am concerned or unhappy.
however, the 1/4" trim on the gunnels/transom do warp. To minimze the warp, you really need to slot the screw holes some to allow for the expansion. however, this does not allow you to fully tighten the screws.
The bottom transom trim panel strip has through bolts and this one warps so bad, you could drive a car behind it! :mrgreen:
Thinking for this bottom trim panel, the best solution is to remove it, put in the through bolts underneath the trim. These bolt help hold the back transom panel in on this model Grady. Then, I could install a simple trim over top with some slotting and help this warpage. Might experiment on that this winter.
Until then, I have not found any substitute material that is affordable and stable. I do like the looks of the seafoam starboard as it blends in with a nice trim look to the edges if nothing was there.
Also was thinking about the stick on trim Grady uses, but think this would show uneven differences more than a more firm piece of trim.