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I see that the majority on this forum use Silkaflex to seal expansion joints. Rapid Set self-leveling sealant seems to be a newcommer for this purpose. Silkaflex is Polyurethane and Rapid Set is Polyether so different characteristics. Any opinions would be appreciated.

I have been researching this for days and need some help. My garage has a concrete floor. I live in Sacramento (a Mediterranean climate) I ground my floor with a 70 grit grinder to get the epoxy applied 22 years ago and I now have a smooth and level surface with no cracks. I had the expansion...