I am going to attempt replacing a few leaky freeze plugs on my 4.0 I currently live in southeast Georgia so I don't anticipate a deep freeze. What are the thoughts on using rubber plugs with high temp RTV sealant vs the metal plugs. My reason is limited access to the leaking plugs. Fortunately the leakers are reachable but I won't be able to hammer the metal ones in. This is my alternative to pulling the engine out to replace them.