I need a water pump gasket for my mustang water pump.What can I use if I have no gasket material?
I wouldn't use anything except what was required for that pump installation because I wouldn't want to have to go back and do the whole job a second time if the pump leaks around the gasket area. A new gasket should come with a new pump. If not go back to a quality auto parts store and get a gasket. I'm not sure I'd trust the squeeze on gasket silicone in place of a gasket and I'd get Permatex gasket sealer to use with the new gasket on all surfaces before I reinstalled the pump. It's worth taking your time to do it right. Make sure there's no antifreeze coolant oozing onto the metal sealing surfaces, because the gasket won't seal unless the surfaces are clean and dry (been there, done that).
You get some gasket material.