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Need help sealing large window gaps


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My 85 Rogue is undergoing a major repair .... leaky windows & roof over the years has taken it's toll and the prev owner never maintained any of the issues.

Yesterday I cut out the wood rot under my biggest side window and put in new insulation. I put a new panel over it, cut to fit the window frame. Then I took the window out to reseal it.

I was shocked There's no way the butyl tape could seal this window and no amount of putty will help. There's a good 3/8 inch gap all way around the frame when it's inserted into the hole in the wall. With liberal amounts of butyl tape applied, I can still see daylight in three out of four corners. It's almost as if the hole in the side of the motorhome was cut to fit the outside window flange, NOT the smaller end of the window frame.

I would really appreciate some suggestions on sealing this bad leak. I have not pulled the other windows yet but they are all smaller and none leak to the degree this one has over the years.

HELP!

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