I read some posts here that mentioned trying the AquaMix Grout Colorant to get an even grout color. The fading from darker lo lighter grout areas on my 1 month old floor isn't terrible, but I have to say that an even look would really be nice. Anyone actually use this stuff or have heard first hand if it is any good? Also, the support guy from AquaMix said that it's also a sealant which I wanted to do anyway. So, is there a down side to this approach.