 And then secondly, if you let a lot of water get in there, it'll freeze, and then it'll expand, and that'll make the cracks wider. So what I suggest you do is simply to caulk those cracks and use silicone for that, or you could use caulks that are specifically designed for concrete that are latex-based. Quikrete makes products like that. As to the color, if you're concerned about the color, I'll give you a trick of the trade, but it's a little bit,