Proofing against corrosion with threads?

[Casey Lynn]

There is another thread here from around a couple months ago.
Probably the best sealer to use is the Teflon based thread sealant. We used to recommend gasket sealer until the mechanics around the Miami and Florida Keys area let us know that the Teflon based sealer worked a Hell of alot better for them. It simply does not go away. Like Fleetwin said, any bolt that has a long shoulder on it make sure to coat the shoulder area as well.
Yamaha apparently now recommends this sealer as well. Apparently they listened to their customer base as well. Any of my offshore customers I still work on get this treatment………Nothing like answering the same question twice! Is this the first stage of….what was I saying?

[Tubs]

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

• This reply was modified 7 years, 2 months ago by Tubs.
• This reply was modified 4 years, 11 months ago by Tubs.

[PugetSoundBoater]

From my research on galvanic corrosion(electrolysis) from dissimilar metals on aluminum using steel or stainless bolts, do not use anything with copper in it. I found a product that I’m using now.. Jet Lube Marine Non Metalic Grade Anti Sieze. Got it through Fastenal company. You can google "Galvanic corrosion" or "Electrolysis " and you will find more info than you will want to look at. I run in salt water and fix up outboards that have been used in salt water. A challenge to remove bolts, I use a 50/50 mix of power steering fluild and acetone. Let it soak around the bolt , use a propane torch to heat around the aluminum block and take your time. Reapply the 50/50 mix and it will get sucked into the crevices/threads. Give the bolt head a good smart whack with a steel punch or the like. Be gentle working the bolt loose ,work it both tightening and loosening. You tube has videos of these methods.

"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson

[Casey Lynn]

Thats great information but PTFE does an amazing job and is readily available.

[Mumbles]

Any particular brand and is it available from an auto supply? I have several different pipe sealants with Teflon so it should be similar.

It sounds good so I think I’ll look into it.

[billw]

Well, this is very scientific; but when you break a bolt free on a Yamaha, it smells just like the pipe sealant with PTFE that you’d get at Napa….and it’s also white…..

Long live American manufacturing!

[garry-in-michigan]

Back in the mid `50s there was a service bulletin recommending ‘Perfect Seal number 4’ On stainless steel screws & bolts used in polluted or salt water. I’m not sure what the modern equivalent would be . . . 😉

[PugetSoundBoater]

Perfect Seal #4 is still available, just googled it.

"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson

[mr-asa]

Awesome, thanks Garry. I’ll see if I can pick some up sometime soon.

[Casey Lynn]

A good teflon based thread sealer cannot be beat for any saltwater application. Since that is the case just imagine how good it will be for a freshwater engine. As Jeff mentioned earlier he uses basically the same thing.
Dealers in South Florida turned us (OMC) on to this trick decades ago as they were treating gearcase and water pump fasteners with it and they still came out years later when they needed to. Coat the shank in the longer screws as they will seize as well….again, mentioned earlier.
Pretty much anything above the water line and not directly subjected to water can be coated with GSC or gasket sealing compound.

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