Everyone has their own method..I don't advocate mine, but it always worked well and I've been doing it this way, racing and casual riding, for over 30 years.
Always stretch your tires first! a week or two on a rim is good. The other day I glued up a pair of tires that I plain forgot to stretch. That was fun. I used up my quota of suitable words in about 45 seconds...
The key thing is whether the rim is new, or used, and if used, how much glue is on it, and if there is a lot of glue, is it brittle, or soft?
If the rim is used and the glue is brittle, all the glue has to come off, the rim cleaned up down to bare metal as much as is reasonable, then a layer of glue laid on to dry overnight. If the tire is new, a layer of glue on the tire is a good idea. Then a second layer of glue on the rim before gluing up, let dry to beyond tacky, then mount the tire. Pump up full, center, and wait at least 24 hours before riding. 48 hours is better...but I've ridden hard on tires with less than 24 hours drying time.
I always used Tubasti white glue and it always worked well for me. Other glues have different properties and require different handling. Vittoria glue, in particular, probably works better with multiple layers on both tire and rim... I'm impatient with that though, so I never used it.
If the glue on the rim is soft, and adhering well, then one layer is usually sufficient, since it'll dissolve the older glue and the whole mess should stick pretty well. I rode criteriums and time-trials up and down nasty hills gluing in this way, and never rolled a tire...and I took some entertaining curves at full speed.
But old, hard, brittle glue has to come off, no two ways about it. You want to work with a clean, down-to-metal rim, in that case, and proceed as if the rim were new.
It's quite possible, using some of the more--how shall I say?--extreme techniques of gluing, to put the tire on so firmly that you can't get it off without a tire-iron, or something similar. I've seen that happen. If you're in a road race, and don't have full support (complete wheels following you in a car), and you have to change tires fast, you're SOL if you are riding a tire a little TOO glued on. One of the points of a tubular, imho, is to be able to change a tire quickly and easily. If you use used tires for spares, with some soft glue residue already on them, said tire will adhere nicely after a few miles, almost as well as if it had been freshly glued, long as you don't get dirt on the contact surfaces while changing.
Also note that I've seen several instances in which the tire was glued on much more thoroughly than the base-tape... so the tire rolls off the base-tape, which remains beautifully stuck to the rim. Not much help to the hapless rider though. This seldom if ever occurs with quality new tires, but is a distinct risk with old tires.
My two cents...if you roll a tire, though, using this or any other method, don't blame anyone but yourself... you're on your own, pal...we all were..and are, in this particular area..<g>
Charles Andrews
SoCal