Coroplast repair

[NewRVer]

I had to have a gray water dump valve, replaced while under warranty on my reflection. The dealership where I bought it accomplished that. They cut through the Coroplast belly of my camper and never sealed it up. I went back to them and they taped it up but it has come off and I have tried several different waterproof tapes, but nothing will stick. Does anyone have any suggestions on how to repair a slit of about 6 feet long in my Coroplast underbelly?

[Redapple63]

I had to have a gray water dump valve, replaced while under warranty on my reflection. The dealership where I bought it accomplished that. They cut through the Coroplast belly of my camper and never sealed it up. I went back to them and they taped it up but it has come off and I have tried several different waterproof tapes, but nothing will stick. Does anyone have any suggestions on how to repair a slit of about 6 feet long in my Coroplast underbelly?

I suggest scrim tape.

https://a.co/d/8qE0wfG

Bill

[Second Chance]

Mobile home underbelly repair tape has worked well for us - but you need to clean the Coroplast well with alcohol first.

Rob

[huntindog]

I had to have a gray water dump valve, replaced while under warranty on my reflection. The dealership where I bought it accomplished that. They cut through the Coroplast belly of my camper and never sealed it up. I went back to them and they taped it up but it has come off and I have tried several different waterproof tapes, but nothing will stick. Does anyone have any suggestions on how to repair a slit of about 6 feet long in my Coroplast underbelly?

This idea will work depending on where the slit is. If it runs across the width of the unit, get a 1'x4" pine board cut to the length of the distance between the frame rails. This board will rest on the bottom of the frame supported on its ends by the botton lip of the frame. Next you need fender washers and your choice of screws. use them to go thru the coroplast into to board. 6-8 on each side of the slit should do it. Next time you need to get in there it will be easy

[NewRVer]

Thank you. I have ordered a roll of it and will try it out after cleaning the area real good with alcohol as Second chance has stated. Hopefully that works. If not I will resort to reinforcing with a 1x4 piece of pine as suggested by Huntingdog. Thanks for all of your replies.

[Gronk1]

After the fact, but my coroplast was taken down twice for repair to a slide cylinder & dump valve replacement then reattached. A quality repair shop should do this. Cutting the underbelly is just the lazy way out.

[NewRVer]

I couldn’t agree more. Do you have any suggestions for a quality repair shop? We are in South Florida.

[kb0zke]

"Cutting the underbelly is just the lazy way out."

Agree, but the question is what to do after the fact. We, too, had a grey water dump valve replaced the day we bought the trailer, and the tech cut the belly skin. He put some sort of black, sticky patch on it, but that lasted only until we got back to The Ranch. I've tried a couple of different repairs, but none have held for more than a couple of travel days. We're talking about a factory tour in mid-September, so maybe I'll ask some questions then. In the meantime I'll order some of that tape mentioned above.

[traveldawg]

fwiw - I've used Scrim tape a number of time. If the surface to be taped is cleaned using some alcohol it sticks and doesn't come off. Other tapes including Gorilla, doesn't seem to hold up.

[FL-Guy]

Same story, the prior owners let the dealer cut the membrane to access tank valve and put some tape on the cut. Part of the problem is some of the coroplast has a fabric membrane on the outside that makes taping it almost impossible.
Being a retired ED Physician, I elected to "suture" the wound in the coroplast when we got the trailer.

Make small holes about 1.5 to 2" apart on both sides of the cut with an awl aligning them opposite each other. Then threaded some small zip ties through each of the hole pairs (in one side, across the cut on the inside and out the other side.) Do not zip them closed until you have all of them in because you will need the space to get between the sides of the cut to thread them. Use a long nose plier or similar to help you thread the ziptie from the inside back out the second hole. Then loosely start each ziptie loop to make sure they don't fall off while added silicon caulk to the cut trying to keep it mostly on the inside. Then zip up all the zipties just snug against the coroplast, cut the tails and put some caulk on the outside.
Worked out great and DID NOT fall off or open up.

Maybe takes a little longer than slapping some tape on it but its a permanent fix. If you do have to get in there again you can always peal off the silicon and cut the "sutures".