 Uh, or latex siliconized, not silicone, but siliconized. There's a little bit of silicone in it that gives it some good adhesion that gives it good flexibility. The acrylic allows it to be painted and it does a very good job. And it's, you know, it's easy to use. It's, um, in terms of caulk, uh, relatively inexpensive might be buck and a half, two bucks a tube.