I use superglue gel. It has the same main ingredient as the archery instant glues. Works great on vanes and doesn't come off until I want it to. Plus I can get it anywhere! -wally word, grocery store, auto parts etc.
As far as how much, just enough to lay a bead.
Then after it's been in the jig a short time (30-60 seconds) I remove the arrow and wipe away the excess. Works great and cheap too.