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Old 28-01-2016, 14:46   #16
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Oil Filled Rub Rail?

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Originally Posted by unclemack View Post
"Tonight I measured up some stainless steel self drilling screws that I am planning to drive into an aluminium strap inside the profile, to see if that proves stronger. If it works, then I will be able to leave the existing glue points alone, and simply add the strap to the rest of the rail that remains firmly attached."



Hi Matt,



stainless fixings in alloy are known to seize up. That might not be a problem in your application, I don't know.

Monel is usually recommended for fixings in masts etc., no idea if you can get self-tappers though.

Unclemack you are absolutely right. I am HOPING to get away with this by using thin aluminium (4mm) and relying on the relatively protected environment. The other option was a nylon strap and that was going to be horribly expensive and heavy.


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Old 28-01-2016, 16:37   #17
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Re: Oil Filled Rub Rail?

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Originally Posted by unclemack View Post
Hi Matt,
stainless fixings in alloy are known to seize up. That might not be a problem in your application, I don't know.
Monel is usually recommended for fixings in masts etc., no idea if you can get self-tappers though.
I forgot to say, I am using evil Cadmium plated stainless screws to help with this very problem.
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Old 29-01-2016, 17:45   #18
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Re: Oil Filled Rub Rail?

Just a reminder to use anti-seize on those screws if you might ever have to remove them.

a.
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Old 29-01-2016, 17:56   #19
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Re: Oil Filled Rub Rail?

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Just a reminder to use anti-seize on those screws if you might ever have to remove them.

a.
From what I have read, that is the purpose of the Cadmium. I will check, but I suspect anything I do might actually mess with the chemistry to its detriment.

Matt
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Old 29-01-2016, 18:47   #20
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Re: Oil Filled Rub Rail?

The Cad plate is for corrosion residence, like zinc on your anchor chain.
A good anti seize is warrantied


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Old 29-01-2016, 19:30   #21
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Re: Oil Filled Rub Rail?

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The Cad plate is for corrosion residence, like zinc on your anchor chain.
A good anti seize is warrantied
I was reading about it here (Why use cadmium plated fasteners in the aeronautical field) and to a layperson it sounded like it had all the properties I needed "built in"?
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Old 29-01-2016, 21:25   #22
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Re: Oil Filled Rub Rail?

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I have read of voids being filled with oil to prevent rust.

There was a recent post on the Attainable Adventure Cruising website, which is subscriber based, that discussed an oil filled toe rail.

https://www.morganscloud.com/2012/02...steel-part-ii/

Sounds like this has worked for them for a couple of decades.

Later,
Dan
Seems like fish oil would be a better choice than petroleum oil, There is a rust preventative product in NZ called fisholine that worked great but I expect that you could get straight fish oil from commercial fisheries that smoke fish. EPA should not be able to fine you if fish oil got in the water but who knows.
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Old 30-01-2016, 08:43   #23
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Re: Oil Filled Rub Rail?

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Seems like fish oil would be a better choice than petroleum oil, There is a rust preventative product in NZ called fisholine that worked great but I expect that you could get straight fish oil from commercial fisheries that smoke fish. EPA should not be able to fine you if fish oil got in the water but who knows.
A biodegradable oil would be a better choice or so it seems. My first thought was to use Fluid Film but that stuff is too chunky. Then I thought of biodegradable chainsaw bar oil but that stuff is pretty thick and I expect expensive. Then I remembered there is biodegradable hydraulic fluid which would seem to be a better choice at least price wise.

I have read of people using diesel which seems to me to be a bad choice, forgetting pollution issues, because if water did get into the space, it would go to the bottom while the diesel floated on top. How would one purge the water? Course water should not get into the space but stuff happens.

Later,
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Old 30-01-2016, 11:10   #24
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Re: Oil Filled Rub Rail?

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From what I have read, that is the purpose of the Cadmium. I will check, but I suspect anything I do might actually mess with the chemistry to its detriment.

Matt
Ann has some sound advice. The Cadmium plating will do little or nothing for you if you need to remove a machine screw.
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Old 30-01-2016, 11:21   #25
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Re: Oil Filled Rub Rail?

Hi Matt,

Duralac is the stuff I'd use. Just a little blob on the ends of the screws so it fills the threads as you screw them in.

It's a marine grade product specifically for inhibiting corrosion between dissimilar metals, generally used on monel rivets in masts.

Seems expensive for a small tube but it'll last you years.

Whenever using self-tappers it's worth the trouble to find exactly the right drill size to avoid either snapping the screws or having them come loose in a year.

You also might consider using one screw as a tap to cut the threads, fresh ones for the fixings.
Saves having damaged screw heads on the boat.
You could disc-cut (and de-burr) the final screws to a length that prevents them being knocked back through the hull in an impact.
Careful not to double-cut the threads if you do it this way though.

A penny washer under each screw head and a little wrap of butyl (tape) around the screw under the washer should prevent leaks.
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Old 30-01-2016, 22:00   #26
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Re: Oil Filled Rub Rail?

Quote:
Originally Posted by unclemack View Post
Duralac is the stuff I'd use. Just a little blob on the ends of the screws so it fills the threads as you screw them in.

It's a marine grade product specifically for inhibiting corrosion between dissimilar metals, generally used on monel rivets in masts.

Seems expensive for a small tube but it'll last you years.
Indeed! We've had one tube that so far has been used on 300+ tapped holes (various masts, mast steps, fittings, etc) and is still over half full. Just watch your clothing though - it's an awful lime green and stains like a b*stard.....

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Old 31-01-2016, 08:56   #27
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Re: Oil Filled Rub Rail?

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Originally Posted by unclemack View Post
Hi Matt,

Duralac is the stuff I'd use. Just a little blob on the ends of the screws so it fills the threads as you screw them in.

It's a marine grade product specifically for inhibiting corrosion between dissimilar metals, generally used on monel rivets in masts.
If you cannot find Duralac, Tuf Gell works just as well
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Old 31-01-2016, 18:52   #28
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Re: Oil Filled Rub Rail?

Thanks guys. I will add either duralac or tuffgel to the shopping list.


Sent from my iPhone so apologies for weird autocorrect typos.
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