Thread: Which glue for cedar window frame mortise and tennon joints.

Epoxy (2 part mix) or titbond 3

Epoxy or polyurethane
Don't use regular white PVA, it's not waterproof

Should not require glue if the joints are correctly made and the frame designed correctly

Originally Posted by rwbuild

Epoxy (2 part mix) or titbond 3

Thanks to everyone for the quick replies.
I signed up for this forum ages ago, but I must have only browsed the site and this was my first post.

I like the epoxy word. Have used JB Weld in the past for metal repairs and it is good stuff.

I don't think my m&t joints are good enough to go without any glue or adhesive. But I did copy the joint on the original frame, which also has a half cut on the edge that supports the window glass, so it looks fairly strong.

Other windows I have worked on have not been as bad, and I have used epoxy and sawdust to repair small parts of damaged wooden window frame.
I tried Earls Wood Hardener also. But I found it difficult to work out if the product was actually making any difference on loose wood fibres. I just ended up digging out loose timber and cutting small wood patches to fit.