I have a client who wants to fill in his existing bermuda yard with seed.Mainlyl sand on the property about one mile from the beach. There are a few 10X10 areas and that need seed. The coverage he has now is sparse in alot of areas. When I seed new lawns I rake,seed,and cover with hay, water everyday and keep seeds moist till they sprout. Then I cut after a few weeks. I can't do this with his yard. If I let it go for a few weeks all the existing bermuda will get too tall and will brown out when I cut. Enough water for the seed will be too much for the current lawn, any sugestions?