Originally Posted by jtstromsburg
My underbelly is corroplast. Like cardboard but plastic. I've cut it and patched back using gorilla tape. I've heard of "stitching it" with cable ties as well.
Several years ago, the black tank valve cable froze up, and I had to cut into the corroplast belly of my Durango. My biggest challenge was locating the valve. When you cut it, just cut three sides so you have a flap with the 4th side being the hinge. Make sure the hinge side is toward the hitch of the camper. This keeps 60 mph wind from pressurizing the area behind the corroplast.
After you have completed repairs, use jt's suggestion....drill holes about a 1/2" from edge and every 3" around the three cut sides. A hand held hole punch works also. Feed ty-wraps (zip ties) through, cinch them snug, and then apply strips of 3" wide gorilla tape to cover the seams. Befroe applying the tape, wipe the corroplast with alcohol. This will last for years.