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I have a round window frame a built from poplar staves. I need to laminate the inside with the cypress veneer (1/16"+) to the inside of that. The window will be stained glass in a church. Heat from sunlight will be a slight issue. This is the interior side of the jamb. Glass is between interior and exterior jamb. Room is conditioned space.
So this will see no exterior exposure at all? Poplar has about zero rot resistance. As far as glue, I would use either epoxy or resorcinol.
Boats are built using Epoxy and I am no fan of Gorilla glue, Might cost a few extra pennies over the whole cost and look like a couple of nice lunches to pay for but West System ( Boat suppliers) is what you want , this is the job it is made for.
I just did a bunch of glue-ups with resorcinol on cypress. Great glue but a PIA to use and it stains everything that dark reddish brown. It didn't seem to have as much open time as I had expected.
In the end, I chose the epoxy. Used formed cauls made of stacked mdf to clamp against the inside of the veneer and the frame. Had four layers of veneer. Clamped all at once. Dry fitted first to make and cut the veneers to length. Made sure to mark them so they would go back in the same way.
Epoxy would be my choice today. Gorilla glue 3 years ago, and TBIII if more than 6 years ago.
The veneer will give a nice clean appearance. You should have also used Cypress for the rest of the assembly. Polar not only has a short life in exterior situations, it must attract fungus and other microbes.I have seen it sprout fungus blooms after just 12 months outside.
Poplar is not a wood. It’s a weed. That’s why it attracts the plague & pestilence.
Nothing like spanish cedar to kill the foreign invaders...