Our 5th has coroplast covering the bottom of it. The factory cut a 8 - 10 inch slit in it to route a power cable thru it. The original tape job fell off after about a year, and now after 2 or 3 redos with Gorilla tape, I cannot get a tape patch to last longer than about 4 months.The coroplast is now coated with dirt/dust-imbedded adhesive residue which is probably why the tape doesn't stick very well. Not sure how I would get the coroplast cleaned up as it just pushes up when any pressure is applied to it - same problem when applying tape.Any ideas?

CarnationSailor wrote:Our 5th has coroplast covering the bottom of it. The factory cut a 8 - 10 inch slit in it to route a power cable thru it. The original tape job fell off after about a year, and now after 2 or 3 redos with Gorilla tape, I cannot get a tape patch to last longer than about 4 months.The coroplast is now coated with dirt/dust-imbedded adhesive residue which is probably why the tape doesn't stick very well. Not sure how I would get the coroplast cleaned up as it just pushes up when any pressure is applied to it - same problem when applying tape.Any ideas?try clean it up with denatured alchol, that should clean it up nice. you can also put a backing material in there like thin plywood and then screw the coraplast for that then seal it. might last a bit longer.Steve

I can't help you with the proper clean up but I patched my coroplast about 15 years ago with a spare strip of Eternabond tape. Yeah, it's white and sticks out like a sore thumb (if and only if you're under the trailer), but it's been bullet proof the entire time.

On edit, there are awesome cleaning products out there that will deal with anything that's managed to get stuck on. I have a product that's used to prep vehicles for paint that really does a job on anything I've encountered.

Belly repair tapeDo the clear up, hopefully alcohol will work otherwise use acetone. Wear gloves and goggles. Read the reviews of this stuff, surface prep will determine if it works.I used that 4 inch strong gorilla tape with a clean surface and it has held up 16 months

I have not used it but friends have had good luck using this on a clean surface.flashing tape

Patching Coroplast | Good Sam Community

theoldwizard1
Explorer II
Feb 17, 2021
CarnationSailor wrote:
The coroplast is now coated with dirt/dust-imbedded adhesive residue which is probably why the tape doesn't stick very well. Not sure how I would get the coroplast cleaned up ...

It has to be clean if you want anything to stick ! Try Goo Gone.
stripit
Explorer
Feb 17, 2021
I had cut the bottom of my 5th at least 4 times when doing work up under the trailer for slide out motors, plumbing and some electrical. Went to the Lowe's and bought 2x1 6ft wood and cut it to lay on each side of the cut out overlapping the edge by 1 inch. Screwed that wood to the uncut coreplast kleaving the 1 inch over the hole. Put the coreplast up and screwed that to the wood. Was able to get back uop into the bottom by removing the screws when needed. Never had it fail and fall down.
bpounds
Nomad
Feb 17, 2021
I've cut access holes in several places in the bottom corro. I even cut some proactively so that I could inspect or access things like the emergency slide lead screw. On each of those I cut the panel along 3 sides, and simply folded the 4th side for access. Then zip tied along the 3 sides to close.

Not sure if you think you need to fully weatherproof afterward. I didn't. If you do, the belly tape works well, and combined with the zip ties it would stay in place even if the adhesive let go. Even better might be an overlay patch.
dedmiston
Moderator
Feb 17, 2021
Fizz wrote:
Side note:
Gorilla tape only sticks to itself, even then it's not for long.

But their hair products are to die for.
Edd505
Explorer
Feb 18, 2021
Use aluminum tape, water proof, cheap,& available most hardware and big box stores. Mobile RV repair told me to use it, a year now and 15,000 miles, no sign of coming loose.
Beaker
Explorer
Feb 18, 2021
At Lowes you can find a spray adhesive,Loktite, that I have used on that black tarp on bottom of mobile homes. It stuck when black tape,
grey tape, and even eterabond wouldn't. Clean good, follow instructions on can, and right after sticking, I used the handle of the sissors to press it. Has held real good.
CarnationSailor
Nomad
Feb 18, 2021
And the winner is........zip ties!

They closed it up nicely and I didn't have to bother with cleaning off the old adhesive first!

Thanks to everyone for all the suggestions.
shum02
Explorer
Feb 18, 2021
CarnationSailor wrote:
And the winner is........zip ties!

They closed it up nicely and I didn't have to bother with cleaning off the old adhesive first!

Thanks to everyone for all the suggestions.

:)
StirCrazy
Moderator
Feb 18, 2021
CarnationSailor wrote:
And the winner is........zip ties!

They closed it up nicely and I didn't have to bother with cleaning off the old adhesive first!

Thanks to everyone for all the suggestions.

what did you use to seal up the crack so water doesnt get in?

Steve
CarnationSailor
Nomad
Feb 18, 2021
StirCrazy wrote:
CarnationSailor wrote:
And the winner is........zip ties!

They closed it up nicely and I didn't have to bother with cleaning off the old adhesive first!

Thanks to everyone for all the suggestions.

what did you use to seal up the crack so water doesnt get in?

Steve

It's too far from the tires for them to throw water up it, and any other incidental water that might splash up will not likely get thru the joint because the two edges are tight against each other. It would be necessary to seal it if water could accumulate on the surface, but it can't.