How much old glue is too much?
Not sure if this is the right forum, but here goes:
So I'm gonna be switching out my Conti tubulars tonight for some Vittoria Paves for an upcoming Roubaix-style race. I'm wondering, how much old glue on the rim is too much? The rear has been glued up several times, and it's pretty nasty. They're aluminum rims, so I can use nasty solvents to get the old stuff off, no scraping required. I'd just prefer not to go through the 24-hour drying on the initial coat again if I can help it.
Also, with the Vittorias: the manufacturer says use a solvent to get the latex off the base tape, Zinn says to use a scraper. I'm afraid I'll choose the wrong solvent and separate the base tape from the casing. Advice?