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Foaming the Hull ?

 
 
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Old 10-02-2010, 12:48 PM   #1 (permalink)
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Foaming the Hull ?

Ive heard that spray foaming a steel hull is the best way to keep it from rusting. Anybody have experience with this? Any special type of foam or methods need to be employed?
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Old 10-02-2010, 01:44 PM   #2 (permalink)
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Originally Posted by fantasymaker
Ive heard that spray foaming a steel hull is the best way to keep it from rusting. Anybody have experience with this? Any special type of foam or methods need to be employed?
Are you asking about the treatment for the inside or the outside of a hull?
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Old 10-02-2010, 02:16 PM   #3 (permalink)
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That would be the inside. I've heard about doing it both for rust and sound dampening. DK the type, but it would have to be a very high density, non-moisture absorbing type or else you'll end up trapping moisture against the hull. I also personally DK any boats this was done on so can't attest to it working good, bad or in between.
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Old 10-02-2010, 03:07 PM   #4 (permalink)
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Hi,

I would think it was for the inside myself but thought I better check as one never knows what new ideas one will see on here.

It could be some sort of close fitting permanent fender system if it were applied thick enough.

Here is the gear that is used by a lot of the worlds top Yacht Builders on the inside of Steel and Alu structures.

http://www.mascoat.com/mascoat-marin...ing-paint.html
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Old 10-02-2010, 03:27 PM   #5 (permalink)
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What Id heard of was on the inside but WOW a outside plan would be even better!
I like the Idea of sound deading and heat insulation so the outside job would be great but what Im really seeking is rust proofing so inside would be needed.
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Old 10-02-2010, 04:14 PM   #6 (permalink)
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what Im really seeking is rust proofing so inside would be needed.
Looks like K1W1's link is exactly what you're looking for "This coating can replaced most blanket and foam insulation products". Looks like foam was yesterday and this is today.
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Old 10-02-2010, 04:15 PM   #7 (permalink)
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This yacht have it on the outside which is a good solution on older boats where you don´t want to strip the interior. http://www.fagerdalamarine.com/
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Old 10-06-2010, 11:30 PM   #8 (permalink)
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Why isnt foam applied on the inside below the waterline?
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Old 10-07-2010, 12:44 AM   #9 (permalink)
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Hi,

Lars, Have you seen that Fagerdala Treated yacht up close?

It was in a port I was in a couple of years ago, I was amazed at how shiny and smooth it is.

Strangely there does not seem to have been much of an uptake if any by the top end builders of this system.

There was an article a couple of years ago touting it was to be used on the conversion of an Ex Scottish Fisheries vessel in the UK that was becoming a yacht.

I have recently been told that this particular conversion seems to have shuddered to a halt and the project vessel is an abandoned hulk.

I don't know if this was a result of an over ambitious refit proposal or another reason beyond the shipyards control.

I am envious of a steel hull that can be faired by 1.5 to 3.0mm of LW Filler. If the decimal point were removed it would be a lot closer to the real-life scenario being applied everyday in megayacht yards the world over.
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Old 10-07-2010, 03:13 AM   #10 (permalink)
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I am not a big fan of spray-on insulation on the inside of the hull. For a few reasons:

- It is impossible to take a piece of insulation back out to make a repair to the hull or just to check in general. Now that may not be a concern in the first two years, but after 10-15 years it surely is.

- During construction, after the spray-on insulation is applied, workers will still need to add supports for piping and cable trays. The spray-on will already be damaged in many parts before the boat leaves the yard. Result: condensation spots, mould, etc... Same story for a future refit.

- If your insulation goes foul for some reason and smells terribly, how are you going to replace it?

- Call me a tree-hugger if you want, but at the end of the boat's life, it will have to be stripped and its parts recycled. It will be nearly impossible to separate the spray-on from the aluminium or steel, causing a huge loss of material (and by that time, probably will cost extra to scrap).

This Fagardala system is completely new to me. Need to have a look into that.

Bruno
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Old 10-07-2010, 03:38 AM   #11 (permalink)
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K1W1, i took these pictures of United Spirit two weeks ago. One of her KaMeWA jets was not in place, but otherwise she looked OK. This foam was added almost 20 years ago and I have just seen a minor crack about five years ago. It is pretty easy to repair from outside.

This boat was built in 1939 in 5 mm aluminium plates with rivets. The idea with applying foam outside on new constructions was to use robots for both the final shape and fairing. This shipyard have two ABB robots installed, but have not used them for this application. On older boats it is more man-hours, but not many more than putting tons of filler to sand down.
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Old 10-07-2010, 06:06 AM   #12 (permalink)
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Quote:
Originally Posted by fantasymaker
Why isnt foam applied on the inside below the waterline?
At least on inspected vessels foaming below the waterline could hide problems.
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Old 10-09-2010, 01:31 PM   #13 (permalink)
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I see it was foams ability to protect from rust that interested me. And while I dot think I would pull any other coating off to see what is going on under it I can see the point of its greater susceptibility to damage.
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Old 10-09-2010, 03:00 PM   #14 (permalink)
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its greater susceptibility to damage
Not so much it susceptibility to damage, in fact quite the opposite, but the fact that it will hide it.
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Old 10-09-2010, 03:19 PM   #15 (permalink)
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Quote:
Originally Posted by fantasymaker
I see it was foams ability to protect from rust that interested me. And while I dot think I would pull any other coating off to see what is going on under it I can see the point of its greater susceptibility to damage.
That's not totally true. If the foam is only applied on the inside and adhears properly, and the boat is audiogauged on a regular basis, it should pick up any thin spots in the steel.
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