YoYoExpert - Flowable Silicone for all your o-ring grooved yo-yos!
This silicone is normally used as a sealant for windshields or glass is used to flow into the o-ring grooves of most yo-yos today and once dried gives excellent bind returns.
Simply fill the groove in the yoyo with the Flowable Silicone and smooth it out. Wipe off any excess, and let dry.
In about 12-24 hours, you'll have a yoyo that binds tightly and doesn't snag (if done correctly).
We highly recommend this link by Doctor Popular:Flowable Silicone Instructions