Black stains

[Over59]

Yesterday I power washed the 59 Overlander. There is some black pitting on the skin and roof. There was also something that dripped on top and ran down over the end caps. Mostly came off with metal polish were I tested it. Did not come off with citrus paint stripped.

Then I power washed the inside. Everything is out, including the rear floor section. Much of the interior had been painted twice, blue / green, then white. The mildew / mold came back after two bleachings. So.. car wash solution, bleach for the 3rd time, deck restorer, more direct hit power washing from 1 inch away. Alast there is a black stain in the zolatone that does not come off in places that were not painted. Not a big deal on the few panels I'll be replacing because of holes. The latex paint came off some places but not all. Then under the paint more layers of black stains. There was no indication of a fire so it must be mold / mildew. (whats the difference anyway).

I need a stripper which will take off the latex paint but leave the zolatone. I really don't what to have to deal with stripping the ceiling or good walls. Then how to kill the black stuff so a year or two from now it's not working it's way to the surface again.

Also, any reason to not use the olympic rivets for the interior other than size.

[Ken J]

Don't know about the black stuff, but I'm using a citris stripper on my interior - does a great job with the latex, leaving the zolatone intact (mostly).

Olympics should not be a problem in the interior, I assume you want to match the overhead round rivets that are already there.

Ken

[markdoane]

I think the only problem with the Olympic rivets on the inside would be that some of the rivets might be close to the web of the frame/rib, and therefore one of the legs might not be able to expand fully.
Otherwise, if you are redoing the ceiling seam which was originally bucked rivets, they should work fine.
Regarding the stain, if it bleaches out then re-appears, it is definitely organic and not soot. Could you try peroxide on a small section? If that doesn't work, maybe just use Kilz to seal it in. Use a hairdryer to make sure it it bone dry before you coat it with anything.

[Over59]

On the paint it bleachs out but the black on the zolatone doesn't. Looks like a job for tsp and scrubing pads. Then I'll lightly sand and kilz. All the inside paint has to come off as I think this stuff is everywhere.