I have a member in my Family whos yard is mostly clay, in central VA. I would like to aerate and seed for them this weekend. The lawn is fairly level and it's about 15,000 sq. ft. Do you know of any product I can apply to help brake up the clay.? They have some grass, but it's very thin and alot of bare spots. I have aerated many yards, as I own a Classesn split drive, but I am looking for something that might help this yard. I will probably take some soil samples this weekend for them.