Mike, Glidden Gripper Primer costs 4-5 bux a gallon more than TB II around here.
TB II also provides very resilient bump protection over foam that paint can not match. So, Gripper for gluing tight joints only in the case of foam on foam, metal to foam, etc. TB II for canvas on foam & wood on wood. Great stuff for filling gaps, foam to foam in general, wood to wood & wood to foam if fit is poor (it also sands better than Gripper), etc.
I tried Gorilla Glue but did not care for it (inconsistent foaming) and GS is cheaper for the same uses.