PL Premium...
http://www.loctiteproducts.com/p/12...remium-Polyurethane-Construction-Adhesive.htm
note...
it will expand so weight down your plaque till the adhesive is cured....
http://www.loctiteproducts.com/p/12...remium-Polyurethane-Construction-Adhesive.htm
note...
it will expand so weight down your plaque till the adhesive is cured....