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Old 09-03-2007, 04:12   #1
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Napa Permatex Anti Sieze

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My Local Power Boat mechanics swear by this stuff to prevent problems between stainless screws into aluminum boats.

I am mounting some winches on my aluminum mast, and they suggested I use this. Anyone ever use this stuff?


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Old 09-03-2007, 05:00   #2
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The yellow paste we'd use this side to prevent corrosion is not under same brand name, but suggest it has same properties.
It simply prevents oxidation twix the dissimilar metals and is VITAL when you touch stainless to aluminium.
Not just screws - rivets also.

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Old 09-03-2007, 05:21   #3
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Avoid any Anti-Seize dielectric compound containing copper, silver or graphite, as these often promote galvanic corrosion of aluminum.
Permatex Anti-seize Lubricant contains a blend of Aluminum, Copper, & Graphite, and is NOT recommended for Stainless fastenings in Aluminum substrates.

Isolate Stainless Steel Parts, from Aluminum Parts with nylon or mylar insulator pads, washers and/or sleeves.
Isolate Stainless Steel Fastenings from Aluminum Parts with Non-Metallic Dielectric Anti-Seize compound.
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Old 09-03-2007, 05:43   #4
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When you wrote that Permatex Anti-sieze should not be used on aluminum, I nearly passed out since I have been putting up a new mast and slathering the stuff on every bolt. I ran and got my little tube of #133A compound, put on my glasses and read the fine print. While it does not say what the ingredients are, it does say "Eliminates galling and cold welding of threaded fasteners especially on aluminum and stainless steel."

I take this to mean they recommend their product for this purpose.

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Old 09-03-2007, 11:25   #5
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NOT between the two metals when used together. Yes it is great if it is SST to SST and Ally to Ally, but not SST to Ally.
Best product for SST to Ally is Lanacote

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