I have a deck that is just about one year old. I had a painter (or so I thought he was a painter) come and treat it with a Cabot's preservative. Well the guy really messed it up. There are spots, drip marks and overlap marks all over the deck. It looks like it has been there for ten years. When I asked him about it he suggested that he would come back and spot sand it and retreat those areas. Before I have him do anything I was wondering if anyone has any other ideas. It is a real mess.