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Old 08-15-2022, 09:43 AM   #1
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2004 Mountain Aire corrosion on bottom of basement doors

Hi all, we are most likely buying the above unit. It's a 3781 with a workhorse chassis. Most of the basement doors have what looks like corrosion on the very bottom of the doors. It's actually on the part that faces down to the ground when shut. It looks like it is coming from under the paint and pushing through cracking the paint. No chips that might indicate damage from rock chips, etc. Pretty sure the doors are aluminum so it isn't rust (or shouldn't be).

Has anyone else seen this? Did you remove it and repaint?

Any suggestions/help is appreciated.
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Old 08-15-2022, 09:49 AM   #2
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Pictures will get you much better answers, but if you are talking about brown stuff that does not come off with a simple washing, I too had that on our "new to us" '04 pace Arrow.
I used "polishing compound" NOT "rubbing compound" to clean up the bottom part of the doors where they roll under.
Sees like it was a hard water stain on our white doors.

Mike in Colorado
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Old 08-15-2022, 10:11 AM   #3
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Originally Posted by Flyer15015 View Post
Pictures will get you much better answers, but if you are talking about brown stuff that does not come off with a simple washing, I too had that on our "new to us" '04 pace Arrow.
I used "polishing compound" NOT "rubbing compound" to clean up the bottom part of the doors where they roll under.
Sees like it was a hard water stain on our white doors.

Mike in Colorado
Thanks, We don't have the unit yet but we looked at it yesterday. I failed to take some pics.

It is definitely not stains. It literally looks like rust pushing through from under the paint. Shouldn't be if it's aluminum door panels. The doors are darker and there isn't any discoloration. I've attached a pic just to show the color.
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Old 08-15-2022, 03:26 PM   #4
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The lower ( curved edge ) of the cargo doors is aluminum and corrosion on the aluminum bubbles the paint . Some careful DIY sanding , filling and repaint is possible to dress things up .

I've even seen the edges re-done with a rock guard finish , rather than straight paint .
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Old 08-15-2022, 05:59 PM   #5
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The lower ( curved edge ) of the cargo doors is aluminum and corrosion on the aluminum bubbles the paint . Some careful DIY sanding , filling and repaint is possible to dress things up .

I've even seen the edges re-done with a rock guard finish , rather than straight paint .
Thanks. That's what I thought I might do. I thought black paint as the top is black. I think I might like the rock guard finish. Thanks again.
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Old 08-16-2022, 12:02 PM   #6
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It's electrolysis which attacks the aluminum. It will blister like a pimple. When you sand or break it open it will produce white powder. As you clean and sand, it will leave some light cratering as it's actually eaten away the metal.

If it were me, I would mask off and protect the lower painted portion that shows, do your sanding and prep and then use something like a black undercoat or textured paint to protect it.
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Old 08-16-2022, 06:50 PM   #7
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It's electrolysis which attacks the aluminum. It will blister like a pimple. When you sand or break it open it will produce white powder. As you clean and sand, it will leave some light cratering as it's actually eaten away the metal.

If it were me, I would mask off and protect the lower painted portion that shows, do your sanding and prep and then use something like a black undercoat or textured paint to protect it.
Thank you. That sounds like a good idea.
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Old 08-17-2022, 04:35 AM   #8
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Aluminum oxidizes just like steel.

Depending on how bad it is, I would either:

1. Leave it alone. It has taken 18 years to get to the point it is now.

2. Mask it off, sand it down, and coat it with your choice of bedliner.
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Old 08-17-2022, 07:51 AM   #9
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Are you talking about the exterior aluminum skin or the aluminum extruded door frame that makes the box that isn't visible when the door is shut?
For other than the exterior, wire wheel, clean, mask, prime and paint.
For exterior, that just depends on how involved you want to get if the exterior paint is damaged (or will be damaged by the repairs).

If exterior skin, you could: refinish back the way it is (most expensive), paint a solid border down the whole length (not just that door which would look funky), fix, paint and put aftermarket chrome trim over the repair area so you don't see the funky color paint you put on.
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Old 08-17-2022, 08:12 AM   #10
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Are you talking about the exterior aluminum skin or the aluminum extruded door frame that makes the box that isn't visible when the door is shut?
For other than the exterior, wire wheel, clean, mask, prime and paint.
For exterior, that just depends on how involved you want to get if the exterior paint is damaged (or will be damaged by the repairs).

If exterior skin, you could: refinish back the way it is (most expensive), paint a solid border down the whole length (not just that door which would look funky), fix, paint and put aftermarket chrome trim over the repair area so you don't see the funky color paint you put on.
Yes, it's the exterior. As others and you have stated, I may do the entire bottom of each door as most of them have it. Most likely will use a rock guard paint and a dark color to match the upper dark color. I can get the actual color but I'm not sure how well I can blend it.

Thanks.
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Old 08-17-2022, 08:23 AM   #11
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Depending on how high it goes up the doors I like the couple suggestions of either a rock guard or maybe something like a colored bed liner type spray on once youíve cleaned it up.
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Old 08-17-2022, 10:54 AM   #12
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Bentjm has the best / most cost effective (read cheap) solution.

Tape the doors off at the crease, where it rolls under, and spray the bottom with Bed Liner.
Heck, even black Krylon will outlive most of us.

Mike in Colorado
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