Another trick is to use a resin brush and apply the glue with that. Rise it off in warm water and it will last indefinately. It's a lot easier to control the dose than a glue bottle nozzle. It is also great to pull excess glue off the wood and corners around a joint

I helped an Explorer post build four LT-40's with Titebond II. Of the four teams, one used 1/2 of a bottle. One used TWO BOTTLES. The other two teams each had some left from one bottle.

All flew fine.

But, as a rule of thumb, lighter flies better. Just enough of anything is the goal in airplanes - models or the real thing.