I'm repairing an old teak garden folding bench seat. The slats for both the back and seat require replacing.
The seat slats aren't giving me any bother, but the back slats are loose tenoned into two horizontal timbers which would require major dismantlement to remove. I've tried removing one of these slats by bending to see if that would be the way to get new ones in, but it just broke.
My thinking now is to cut away the back of one of the mortices with a thin saw, slip the slat in and then re-glue the cut out piece, but am wondering what glue would best. Waterproof PVA exists but cannot be relied on if the wood is permanently damp - PU I don't fancy and it also has caveats against it. The DIY Wiki doesn't give any clear guidance on this.
Suggestions ?
Rob