Change the valve cover gasket because of leak over the t-housing about 2 months ago. Since the last time I changed the oil ( 2 weeks ago) I've got some leaks from the valve cover. The drain plug and filter are tight. That's the first thing I checked. Can I use anything along with the gasket to make a better seal instead of another $30.00 or so on a gasket. I don't know, silicone maybe ? RTV ?