I had a new asphalt driveway put in six months ago and it was still very soft. I was told to get a bag of Portland cement and spread it over the driveway with a broom, just brush it in to the driveway. Well, I did this and my driveway is hard now, but looks pale like the cement. Can I put an asphalt sealer over my driveway now? I am not sure how it will hold, or if the cement will cause other problems. I was told brushing cement over the asphalt will make it hard and last longer.