Acetone eats through just about anything given (not much) time. I work with the stuff on a daily basis, and I guarantee that you'll have issues if you use it regularly. A much better additive (and one that doesn't tear everything up quite as quickly) is toluene (which I also work with on a daily basis). It'll raise your octane 4 or 5 points (a 6:1 ratio is safest) and it won't eat through rubber as long as it's well cross-linked.
Using acetone on a regular basis isn't such a great idea.