I have some pella casement windows in my house. they are clad casement and the seal between the cladding and the wood failed on the bottom of the sash and as a result wood part of the sash is rotten. Checked with pella and a replacement sash was $500 which is probably more than the double casement unit cost in the first place. Years ago I had a similar problem and got some 2 part epoxy to repair that one. It was quite thin after you mixed it up and it soaked right into the rotten areas of wood and after it set it was very hard. It held up for a number of years. I have no memory of the brand or where I got it. I googled and came up with a lot of different products but it seems kind of hard to determine exactly which one would be best for my situation. Anyone have any advice on what would be a good product to use? thanks Jared