Well, it turns out, that sometime in the past year, I had purchased a tube of
"Gorilla Construction Adhesive",, and had not used it.
The Liquid Nails product, that would not cure, is a "latex" which allows water cleanup while still uncured.
The Gorilla Adhesive required alcohol cleanup, so, at least the product is different.
The Gorilla label said it was for foam board, and both surfaces could be non-porous,,
So, I tried the Gorilla Construction Adhesive,, SUCCESS!! I then purchased several tubes of that,, all is going well now,,,
According to the label, when both surfaces are non-porous, cure time is about double,,
I put up the foam board with the adhesive, and a day later, all was attached.
I am now attaching 3/8" bead board (kinda like T1-11 with smaller, closer, grooves)
The bead board is going up fine, except,slow,,
Slow is OK, I am in no rush, the last few sheets should go up today,,
Next,
I gotta decide if I should stain, or paint the bead board,,, I would like to do a white, except a white stain is not too common,,,??
Can I stain the bead board some sort of white, or light color, and allow the wood grain to still show?