I leave for the Gloss on for at least one to three hours min before buffing, I am not sure how long it takes to cure fully: it might be a few hours or a week. I have not put on wax over the Gloss on the same day, but that is due to other reasons like rain or its time to go to sleep. I guess the best thing to do is try it and see what happens.
On my car I have had much more luck with just the Resin and Blitz, but on my farthers BMW it does look better with Gloss and then Blitz, why this is the case I dont know.
Powerslave, I disagree, Autoglym Gloss is a polymer not a wax.
Steven