Thanks. I let it sit exposed all winter and the exposed sticky side collected some dust while it more or less cured. I wiped it off with a damp rag and have decided to leave it. Maybe a bit of tack will keep me from sliding so much. Interestingly (maybe), I had hung it on the clothesline and either the clothespin or maybe catching on a decking nail put a small hole in the side near the bottom. I bought some new silicone, put a dot on the tiny hole, and it dried in a few hours. What a difference fresh, undiluted silicone made!