If I recall, Slick 50 contains Teflon, and Teflon reacts with the glow plug element rendering the glow plug worthless.

With the cut throat competition in the glow fuel market, you can bet if Slick 50 was a good idea, they'd be using it.

Don't worry if the sleeve shifts a tiny bit..it needs to be lined up with the ports to run, so get it as close as you possibly can.