Leaky Valve Cover

Ok, so I had a leaky valve cover when I bought the car.
Couldn't get ahold of a cover gasket, so I used black RTV.
Its leaking again....i plan on redoing it this weekend, any tips or ideas to help out?
Should I just get another valve cover gasket? Are there any kind of bolt kits that help hold it down or spread the load more evenly?
Any help is appreciated