Originally Posted by jdgreen
I am installing new tubulars on some Zipp 303 rims. There is a thin coat of glue left on the rim from the previous mount that appears will be very difficult to remove. I am reinstalling using tufo tape. How big a deal is it if I mount without removing the old film of glue?
My opinion is that the mechanical issues with old glue on the rim are:
1. there could be so much build up that lumps on the rim will lead to initially uneven tire lie - such lumps would probably even out over time under tire inflation pressure.
2. there could be so much glue that softens that it oozes on the brake surface after everything sets - I haven't seen this, but I think it could happen
3. the origina glue was not well-adhered to the rim, so even though the new glue adheres to the old glue, there isn't a good connection to the rim!
You said your residual layer is thin, so I don't think you have problems 1 or 2. If it's uniform, I suspect you don't have problem 3. If you're a neat freak, clean it.
I don't know if these Zipps are aluminum or carbon. I'm not sure I'd use much in the way of solvents or scraping on a carbon rim!