RE: foam wing adhesive
I have used 3m 77 and I feel it is a quick easy alternative for Some models. Not all though. The use of resin or PUR glue gives you a very solid, permanent bond allowing you to create a durable sharp trailing edge. Particularly of benefit to high performance models. Like racers and gliders.
The benefit of the vacuum bag is it allows you to use less adhesive to keep weight down. The big benefit to me is getting that great clamping pressure without having to stack all my books and tool boxes on top of my cores. Which still never worked as well as the bag.