I'm using this product to seal the vertical joints on the cedar siding of my house. I have hundreds of vertical joints to seal, keeping water out and rotting the plywood underlayment. This caulk is easy to use and matches the natural cedar color. It's water base make working with it and clean-up easy. The cured caulk is also flexible, so it allows the cedar to expand and shrink without cracking. Also, the Ebay price and fast delivery can't be beat. I will use again.