 And then secondly, if you let a lot of water get in there, it'll freeze and then it'll expand and that will 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. And 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,