I just recently painted some old concrete we have out our back door dark brown. I used concrete paint, but it is now showing every pawprint of my dog and lots of other dust. Is this just due to my color choice? I am wondering if I repaint it if there is a way to seal it so it doesn't show the dust. Light Grey would not look good with out house...We don't want to put a lot of money into this right now, so that's why we painted it! Thanks!