Exterior seam molding source needed

DrewE wrote:
The best I can suggest is checking out the PVC moldings at a big box store. I've seen some variations on panel joints and T moldings and such, I think. You might also have success applying eternabond tape over the seams once you've completely finished the plywood, though I think it would look rather poor.

On the whole, this scheme of covering sounds somewhat problematic to me, for what it's worth. Typical current practice is to have a seamless sheet of flexible filon or similar (a sort of fiberglass laminate, I think) over whatever substrate is used, or else interlocking corrugated aluminum siding strips. Maybe I just lack some sense of adventure or don't have enough faith in unconventional approaches.

Hey DrewE, well not sure about the PVC as it might not be exterior grade UV resistant. That's why I was looking for RV parts. Yeah the tape is not an option either.

As for the covering, that may be true if you're thinking strictly in RV terms, but for marine applications it's not unusual to simply seal then paint over wood. There will be a lower section with another seam running the entire length and I have thought of adding a layer of some sort to protect if from damage from road debris, but still searching for the seam material to see what's available and then work with that stuff, if it exists.

I wonder if there's fiberglass tube somewhere that I could cut to make the corners. Personally I hate working with fiberglass cuz I have a some bad memories as a kid. My dad bought an old fiberglass boat and one summer he had my sisters and me working almost every day re-glassing, sanding and painting that sucker. To this day the smell of fiberglass resin makes me ill, lol.