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DavyRay,

You are correct that the patch is attached just on the perimeter. The problem with putting a seam sealer on the inside is that there is a cotton lining on the inside of the jacket.

And...

It does, but when there's driving rain, it goes straight through the seams, mostly at the corners.

Here's a pic

29871

The patch takes up the entire back of the jacket. There's nylon underneath it, so I'm not too worried about sealing the entire patch, just the seam.

I have a shell that I just got, but it wasn't intended for serious outdoor use. It is some kind of water-resistant nylon that has a huge cotton embroidered patch on the back of it. The jacket works...