Reply by jdmaher

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Posted on Best wood glue for Mortise/Tenon glue up - Exterior Mahogany door

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430 posts in 2604 days

#1 posted 04-28-2012 04:44 PM

Dap’s Weldwood Plastic Resin Glue gives you plenty of open time. It’s a urea / formaldehyde. VERY water-resistant (but they don’t claim to be waterproof). With some protection, I wouldn’t expect any water problems (the glue is INSIDE the joint). Clean up any smears (with water) once its clamped; when cured its a really tough scrape and sand; wouldn’t want to risk marring the mahogany.

The gaps you describe wouldn’t worry me, at all. The faces of the tenons and mortises do virtually all the bonding. Plenty of surface, plenty of bonding. The tenon does NOT have to fill every cubic millimeter of the mortise. In fact, my tenons are always a 1/16” short so that excess glue has somewhere to go. If you have to use a “persuader” to close the joint, you’re tight enough.

Mahogany is nice. Send us pictures!

-- Jim Maher, Illinois

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