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Old 12-10-2020, 05:35 PM   #1
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Rear Bumper Compartment Fills With Water

Hi all. The rear bumper compartment on our trailer gets a lot of water in it when it rains and the water does not drain out. The bottom of the compartment appears to be a piece of sheet metal and it is beginning to rust. I was thinking about just drilling a couple of holes in it so it could drain.

Has anyone else had this problem and what did you do to fix it?

Also, is there anything I can put on the compartment door/flap to make it more weather tight?

Just curious what others have done to address this problem.

Thanks,

Steve
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Old 12-10-2020, 05:56 PM   #2
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YEP...

I drilled a number of 1/2' holes in our 'bumper drawer' floor, then got one of my largest whackers and gave the floor some tilt to help drainage. Marine drainage tiles keep it dry.
POI...it's in all storage compartments.

Bob
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Old 12-10-2020, 08:04 PM   #3
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Robert, you cut a bunch of half foot (1/2’) holes? Seems like a 6” hole is a bit large. Do you loose things out of those holes?
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Old 12-11-2020, 09:54 AM   #4
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Quote:
Originally Posted by ROBERT CROSS View Post
YEP...

I drilled a number of 1/2' holes in our 'bumper drawer' floor, then got one of my largest whackers and gave the floor some tilt to help drainage. Marine drainage tiles keep it dry.
Thanks Bob. Are those tiles easy to cut?

Thanks,

Steve
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Old 12-12-2020, 05:33 AM   #5
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That department is not waterproof and should have drain holes to allow the water out. They either did not drill holes in yours or they are blocked.
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Old 12-12-2020, 06:58 AM   #6
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I drilled holes in mine and have been trying to find something to aid drainage. I will look for those marine tiles.
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Old 12-12-2020, 07:02 AM   #7
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Quote:
Originally Posted by stevejones View Post
Thanks Bob. Are those tiles easy to cut?

Thanks,

Steve
oop's 1/2" holes. 4 across the rear open edge, with the tongue slightly up is stays very dry.

The 'marine' tiles I linked above are very flexible easier to cut and shape than the grey tiles you see in the side storage and rear 'trunk'.

I discovered the marine tiles when I did the anchor & fender compartments in the Allison. 👍

Bob
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Old 12-12-2020, 11:06 AM   #8
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Water in rear bumper!

Yup, everything in our bumper gets wet and stays wet. Our sheet metal is rusting also. The bumper corrosion is just one of many items rusting under our 2019 23 FB. The under carriage looks like its been spending winters in the salt in Michigan. It's never been off pavement. Dealer and AS refuse to address it.

I've also been tempted to drill drain holes in the bottom. The rubber mat that came with the trailer traps the water underneath and stays wet. The corrugated rubber mats are a good idea.
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Old 12-12-2020, 11:21 AM   #9
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I think they used to drill weep holes in the bottom of the bumper compartment and that's all you need to do. I'd make them 3/16" and drill about four of them. I never had a problem with water in our 2008 and it did have holes.

Some people may be confused about whether you meant the compartment in the bumper or those in the trailer itself. Sometimes the latter leak because of poor door seals. They should be sprayed with silicone annually to keep the rubber pliable. I think you mean the bumper and not the trailer body. I would not drill holes in the body compartments as water would possibly drain into the belly pain or bugs could climb up into the living areas.
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Old 12-12-2020, 11:23 AM   #10
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just drilled holes in the 4 corners and two more 1/3 in from the edge
no issues and no water collects
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Old 12-12-2020, 12:47 PM   #11
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Drilled some drain holes where the water would pool, no more bird bath in the bumper cabinet!
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Old 12-12-2020, 01:05 PM   #12
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Wet

Quote:
Originally Posted by Skyhook View Post
Yup, everything in our bumper gets wet and stays wet. Our sheet metal is rusting also. The bumper corrosion is just one of many items rusting under our 2019 23 FB. The under carriage looks like its been spending winters in the salt in Michigan. It's never been off pavement. Dealer and AS refuse to address it.

I've also been tempted to drill drain holes in the bottom. The rubber mat that came with the trailer traps the water underneath and stays wet. The corrugated rubber mats are a good idea.
How about spraying it with flex seal or rust oleum paint to protect it ?
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Old 12-12-2020, 01:15 PM   #13
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POI...just to be clear.
The Classic bumper has a slide out tray.
That tray has the marine tile, the "trunk" along with all storage compartments have a much less flexible tile that required a more aggressive cutting method.

Bob
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Old 12-12-2020, 01:17 PM   #14
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Had the same problem. The Eddie Bauer bumper box is slightly different from non-hatch models, since the bumper is intended as a step, but the solution I used prob applies to others.

By the time I found this, the rust had nearly destroyed the vertical cross member that sits just forward of the bumper itself. That plate is black painted sheet steel. It didn’t have a chance here near the ocean. The floor of the bumper box was two pieces is sheet metal. The upper aluminum plate literally secured to the lower sheet steel with two-sided foam tape. Drilling through those two pieces would have been easy, but likely would have filled the void between then with water.

I pulled the bumper and ordered a new rear cross member through Colonial’s parts department. I had to clean some significant rust off the frame on one side and I treated both sides with POR 10. I ordered a custom cut piece of 1/8” aluminum diamond plate to fit where the two floor pieces had been. I drilled 1/2” drain holes in it and glued it in with adhesive sealant caulk.

So far, so good. On my trailer, leaving that untreated would eventually have rusted through the tail of the curbside frame member.

This area should be inspected from below and from inside the bumper box on a regular basis, IMO.
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Old 12-13-2020, 08:21 AM   #15
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Quote:
Originally Posted by Gene View Post
Some people may be confused about whether you meant the compartment in the bumper or those in the trailer itself.
Title of thread is "Rear Bumper Compartment Fills With Water"

Text of OP is "The rear bumper compartment..."

As there is only one rear bumper not sure why anyone would be confused about what I meant but apparently someone didn't bother to read the original post and just jumped in the middle. Happens a lot I guess.

Steve
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Old 12-13-2020, 11:35 AM   #16
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Just wanted to make sure no one was confusing compartments. Things like that happen all the time and people don't read carefully or come in the middle. Carry on....
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Old 12-13-2020, 02:18 PM   #17
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We have a rear bumper & a rear bumper drawer...

Bob
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Love for the Adirondacks

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Old 12-16-2020, 10:35 AM   #18
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Quote:
Originally Posted by Skyhook View Post
Yup, everything in our bumper gets wet and stays wet. Our sheet metal is rusting also. The bumper corrosion is just one of many items rusting under our 2019 23 FB. The under carriage looks like its been spending winters in the salt in Michigan. It's never been off pavement. Dealer and AS refuse to address it.

I've also been tempted to drill drain holes in the bottom. The rubber mat that came with the trailer traps the water underneath and stays wet. The corrugated rubber mats are a good idea.
..rubber mat holds the moisture in..do away with it.. drill a couple holes...do not use carpet to replace the rubber mat..it is worse
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Old 12-16-2020, 10:42 AM   #19
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There is an automotive product called Por 15, it’s black paint like, and keeps metal from rusting. Lasts several years. We have leaks, but not in the bumper compartment!
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Old 12-16-2020, 11:28 AM   #20
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Quote:
Originally Posted by shopie View Post
There is an automotive product called Por 15, it’s black paint like, and keeps metal from rusting. Lasts several years. We have leaks, but not in the bumper compartment!
In the past I tried rustoleum and rattle can bed liner. No go. Galvanized is very particular about coatings which will stick. A year ago, I prepped and prepped and used por 15. So far, so good. Prepping included sanding, vinegar soak, por 15 cleaner and metal prep (twice), then two coats.of.por 15 paint.
DO NOT skimp on the prepping!!!!
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