Tom,
This is what ERA recommends:
https://www.amazon.com/Walker-35959-.../dp/B000CQDL94
If you use it, wear disposable latex gloves because it is a tar-like substance. It cleans up easily with mineral spirits. When I last used it, I looked on-line for information on how long to let it set up before starting the car but didn't find anything so I let it cure for a couple of days. When you first start the car, it will smoke a lot but that dissipates quickly.
I agree with Olddog - actually, not that they should be shot, but I think his point is that slip fits are a pain in the ass and are troublesome.
Kevin