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Polyurethane is rather resilient but a clingy material when rubbed.
Have you tried looking for brake lube from McKay at your auto parts store.
It comes in a small squeeze bottle and it has a clear liquid lube inside. It's made to be used on rubber parts. It's a brake parts assembly lube. It protects the rubber from those under the car elements. Especially, caliper piston dust covers and wheel cylinders boots.
Polyurethane should not need the protection but it cannot hurt it either.
A silicone grease will work but it's really a "clay" lubricant in a carrier only. Talcum powder can do as much down the road.
I have seen Permatex dielectric grease but it is for another purpose and Permatex is very proud It.
The Permatex/ Loctite products are doled out in the smallest quantities possible at the biggest prices possible anymore. It kinda bends my nose as they use to be not that way!
Even though they present some "fine" products, purchased from other companies and put under their labels, they always want a "finders" fee in there too!
This is all good for these new "Macy's looking department stores" or so called parts houses bottom line as well!
I feel like I'm in a dealership for parts. Nope, I will take that back, even they are not that fancy and we know their prices!
McKay is an old school products name and priced accordingly for its purpose. Used by lots of shade tree mechanics.
McKay and Berryman made parts cleaners for years. Now all you seem to fine is Berryman and it has gone be-zerk in dollars per gallon now! I see it from $17 to $30 a gallon depending on who wants to gouge you! McKay is usually the lower priced one, if I see it!
This is just, IMHO and a rant you know! (:-)
Phil
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