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Unread 08-05-2015, 08:53 PM   #4
Tiger Mountain Tile Inc
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Join Date: Feb 2011
Location: Issaquah, Washington
Posts: 7,085
Issac, I did an outside deck about 4 years ago. Slate and CBP natural gray. I ended up using backer rod and CBP's 100% color matching silicone and it worked great. It's a little soft for my tastes but it matched perfectly. The deck is in the weather and I just got an update on it earlier this summer and everything has held up great.

Their silicone meets shore A hardness which is what you need for exterior applications. Urethane is probably a better choice but you won't find a matching color like the silicone. It matched great.
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