Re: Pvc stringers?
After working with dimensional PVC boards on my hard top project, I would advise against using them for stringers. I say that because they compress easily and do not rebound, they have practically no structural strength in any direction, and any fasteners put in them will strip out very easy.
The problem with the PVC boards is that they are dense enough to be very heavy, but are actually a foam that has no strength.
The PVC Sheets that are designed to be a plywood replacement could be another story all together. Those I did not use and have no experience with.
BTW, I can tell you that epoxy sticks to to the dimensional PVC boards so well that if its removed, it rips off a chunk of PVC. All I did was sand it lightly to remove the glaze on some pieces, others the cut face was porous enough as is to make a great bond.