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I need to take 2 factory make 30 light doors that are 36" wide x 112" tall and prep them for concealed vertical rod exit devices.
My go to epoxy has always been West system. Use the 105 Resin and 206 Hardener for most things. You can use the 205 hardener to speed things up, but pot life is compromised. You'll need a lot of clamps as it's an overnight cure.
They also have another product called six-10 which comes in a caulk style tube and has a mixing spout. The product is much thicker then the 105/205 combo.
exterior doors? .. I use Resorcinol. (NOT powdered urea resin "brown glue")
The only caveats with Resorcinol are that some consider it "finicky " (Which I do not)
I 2nd the use of Resorcinol. Long track record. Used properly it will not fail.
Resourcinol always has formaldehyde as a catalyst. Ventilation is essential when using and for some time afterwards as the "F" is released into the air.
Epoxy for exterior probably needs a uv stabilized type. Epoxy also needs a thick joint so that there is enuf adhesive to generate the required amount of heat for there to be a good cure. This is where many bad stories about epoxy come from- too much pressure so the glue line is too thin.