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Old 09-11-2013, 12:07 PM   #1
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Polyurea Coatings.....for boats?, Blast & Ballistic Mitigation

Check this out!!



I might want some of this on a vessel...or at least certain portions of:
K5
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Old 09-11-2013, 01:15 PM   #2
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Polyurea Coatings




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Old 09-11-2013, 02:12 PM   #3
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I wonder how it stands up to years of immersion in salt water and/or how much the barnacles like it. Might be the perfect solution for hull blisters, forget grinding, glassing and sealing, just spray the hull with this stuff.

Interesting find Brian!
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Old 09-11-2013, 05:09 PM   #4
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Not impressed...have seen similar coating on vessels all the way to truck liners...

The coating is tough..but once it fails from the deck...it's a nightmare.
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Old 09-23-2013, 10:53 PM   #5
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Doesn't seem to have generated much discussion on this forum, but there is some going on over here:
Polyurea Coatings - Boat Design Forums
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Old 10-17-2016, 04:38 PM   #6
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Quote:
Originally Posted by psneeld View Post
Not impressed...have seen similar coating on vessels all the way to truck liners...

The coating is tough..but once it fails from the deck...it's a nightmare.
BTW what did you mean "once it fails from the deck" ?

Have you ever had any personal experience with this material?

I think some of these chemical variations are a bit different than truck liners.
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Old 10-17-2016, 05:35 PM   #7
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Quote:
Originally Posted by brian eiland View Post
BTW what did you mean "once it fails from the deck" ?

Have you ever had any personal experience with this material?

I think some of these chemical variations are a bit different than truck liners.
Yep...bunch of different ones.

Have seen jobs that stay and jobs that fail. On trucks...haven't seen that many on boats to say one way or the other...but on boats both I know of, the covering failed big time.

We had 2 aluminum commercial boats that had a bed liner variant on the decks...when both failed...it started slow, just a few edges for the first couple years, at about year 3 major sections had let go from the deck but did remain one big sheet for the most part.

If it is that material, I will admit to seeing a few aluminum John boats sprayed out the looked good...but have no idea how it stood up.
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Old 10-17-2016, 06:32 PM   #8
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We had 2 aluminum commercial boats that had a bed liner variant on the decks...when both failed...it started slow, just a few edges for the first couple years, at about year 3 major sections had let go from the deck but did remain one big sheet for the most part.
Reviewing the videos again, and going back thru a few of the various subject threads, I think I detect at least one major problem with these 'coatings', ....BONDING. I think it just not really bond the well with lots of substrates.

You can almost see a hint of that observation you made in that third video after they turn the sample over and peel off a portion of the substrate.

Perhaps the material cures too quickly to bond properly?
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Old 10-18-2016, 07:16 AM   #9
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I have been using the Loctite Black PL roof and flashing underwater for several years on the hull and it has stayed on fine so far.
Some I mixed with 1/32 milled fibers at 30 to 40%, I coated from the bow going back 10 feet underwater. At stern, I used it straight. Adding the glass microfibers really makes the rubber tough. my idea was if I hit something in the water, this would give it more durability at the bow area..
The black PL is simply to seal the hull from leaks and wood eating critters, not worried about super strength. Why I think it stays on, it is stretchy stuff like neoprene rubber. Easy to use, easy to get, did work fine for me. My first test I started about 6 years ago underwater and when hauled in 2014, was good. So now with more extensive usage from 2014 to 2016 has also been fine.

My method was use a 6 inch wide putty knife blade and smooth it onto the surface.
This allows easy control of application.

Black PL after 2 or 3 days can be sanded smooth with 120 grit random orbit sander.
It has also been great for sealing out water above the waterline. It absolutely prevents water movement unlike paints which crack and also let water pass through themselves. I have been using it for sealing in glass and lexan windows too.


here is a 2014 picture. I also rescrewed and sealed the bow. In 2006, I totally rebuilt the underwater hull even repairing many frames. Used about 4000 new bronze screws.
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