I also started working on the outside skirting for the motor home. The drivers side will be about 20 feet long, while the passenger side will be split into 2 pieces because of the entry door and steps.
Not having a huge amount of space limits how much I can do at one time. This is 1/4" plywood, that is being fiber glassed together using some fiberglass cloth and Por15. The Por does not melt the cloth, gets very hard, and according to their website, gets very strong.
The one plus of using either fiberglass resin or epoxy is, it cures faster than the Por does. Either way, the resulting joint will be strong after a few coats.
It may appear in the pic that the joint is overlapped. It isn't. I had painted the ends of some plywood a while back with gray Por, and what you are seeing is the paint at the joint.
