We have double pane windows in our rv, and on at least half of them, the black seal between the?

They have a major window problem. It is so big that Lazydays in FLorida has built a shop just to replace failed Fleetwood windows. A really Poor design, according to everyone.

One other thing. Most double pane windows in RVs do not have a vacuum (or gas) between the panes. They don't have seals that can take the bouncing and overall G-forces that an RV window is submitted to on the road.

I suggest that if you don't have a leak, or a milky discoloration, then keep on truckin' until they get worse. Replacement of RV windows can get expensive.

The only way to repair these windows is to remove them and have the seals replaced at a glass repair shop. Otherwise, the whole unit will have to be replaced.

The vacuum between the two pieces of glass is apparently sucking the seal inwards during movement of the RV unit.

Randy is right. Frankly, I suspect that you need to replace these windows. Consider whether the windows are under warranty.

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