Just FYI, there is a product from LubeGard that does get applied directly to the discs, but it's not a sticky product, rather it's supposed to fill the small voids in the disc surface.

Lube Gard part#90201 Squeak Relief


I don't know that it's what the sales person was thinking of, but it could be.

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...