Aluminum Corrosion?

[Whatatuyl]

I have a 2001 Designer 5er and noticed that the slide out has corrosion pushing through the outside skin on the exterior sidewalls of the slide out. Has anybody noticed this on their trailer? I just purchased the trailer and didn't notice this on the initial inspection. The previous owner had covered it with a thin layer of silicone. I think the trailer was on a seasonal site and the slide was left out most of the season. Any advice would be appreciated.

[Rustic Eagle]

It's possible that moisture may have been finding a way into the slide wall (slide roof seam, window frame, etc.).

If you can, post a pic of the area in question

Bob

[Doug]

X2
Sounds like someone was trying to address a water leak issue.

[tinlizzie23]

Our 2004 Designer 5er doesn't have any issues like you describe that I've noticed on any of our 3 slides, but I will sure double check next time I have a chance. I agree that yours could be the result of leaving the slide out for a long period of time - ours has never been stored that way.

[Grumpy]

Originally Posted by Rustic Eagle

It's possible that moisture may have been finding a way into the slide wall (slide roof seam, window frame, etc.).

If you can, post a pic of the area in question

Bob

Originally Posted by dougtoms01

X2
Sounds like someone was trying to address a water leak issue.

Exactly what the issue is, water got into the walls.

[Whatatuyl]

If its aluminum corrosion wouldn't that mean contact with a dissimilar metal, or even poor grounding. I thought its almost like is in need of an anode for grounding. Water wouldn't have a corrosive effect on aluminum.