When you can see those seems in your rough foundation, it needs a finish coat of plaster. What I do is grind down those ugly, unwanted seems that you often still have in foundations. Then I put a topcoat of plaster over it and end it all with a nice finish. I can also put a finish on steps, walls, or anything that has an unsatisfactory concrete finish on it. This really adds to the effect of a home. When you see your home and think that something just seems like it's missing, or that is could just use a little something extra, a plastered foundation will do the trick.