Well, I'm one who has posted several times on this general topic. Without speaking for anyone else or any other unit, I can say that our bottom gasket or seal on the bedroom slide does not roll out. The side gaskets just 'swipe' along the sides of the slide-out.
What I put on the rubber fittings is really a "conditioner", though I think it may also have a slight lubricating effect. It is really to keep the rubber supple, that is to keep it from hardening. I also use a very light coat of something like "Armorall" on the sides of the slideout to serve as a lubricant. The 'dry' lubricant is for the mechanism.
Hope this may help. It is simply what I have done over the last three years on our Montana.
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