I purchased a boat from a dealer that rents cats at the beach, and to protect the hulls, the dealer put a protective material on the bottom of the hulls. I would like to take it off.
It is medium dark grey, and hard as rock. Any ideas as to what this stuff is? and any ideas on how to safely remove it?
Thanks!
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Ted
Hobie 16
South Carolina Lake sailing
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Concrete on the bottom of hulls
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Posted: Jan 04, 2016 - 08:31 AM
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Posted: Jan 04, 2016 - 11:34 AM
It might be epoxy and aluminum powder.There could be Kevlar fabric on there. Epoxy will soften with heat. Get a variable temperature heat gun and a putty knife. Start at a low temperature. I've done this to an H14 without trashing the original gel coat. Don't get impatient with the heat!
You'll end up with hulls in need of refinishing. Is the current surface that ugly? You're in for a lot of sanding one way or another. Will the current surface not sand out? I take it the dealer doesn't know what's on there. Keep us posted, GH
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'82 Super Cat 15
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Posted: Jan 04, 2016 - 01:08 PM
I think I would have asked the dealer about it before buying the boat....
Spray on truck bed liner?
Grey Marine Tex?
You could try hitting it with a sanding disc or belt grinder and see if it comes off. Or you might just be better off leaving it alone. If it isn't slowing the boat down much, it might be worth keeping there.
sm
Edited by Dogboy on Jan 04, 2016 - 01:09 PM. -
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Posted: Jan 04, 2016 - 06:54 PM
Definitely ask the dealer what it is, so you can make an informed decision about what to do with it.
It could be a dozen different things.
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Posted: Jan 06, 2016 - 05:39 PM
I spoke to the dealer (Ocean Motion) and they stated it is Iron-crete from Mantek.
http://www.mantek.com/pro…+States&pName=IRON-CRETE
They also stated it might chip off. They have had some of this stuff fall off.
I suppose I need to be prepared to restore the bottom finish when I get this stuff removed.
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Ted
Hobie 16
South Carolina Lake sailing
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Posted: Jan 06, 2016 - 06:41 PM
That sounds like a lot of work to remove, and no telling what you find underneath.
How much of it is there?
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Damon Linkous
1992 Hobie 18
Memphis, TN
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Posted: Jan 06, 2016 - 06:54 PM
It runs the length of the portion of the hull that typically sits on the beach, to protect against damage from dragging on the beach - a long length. I can sand it down some, and smooth it out if not remove it completely. I will probably have to do this next winter when I have a garage. Or I could buy an F16.
Here is a reply to an inquiry to Mantek:
Edited by yelkenli1 on Jan 06, 2016 - 07:55 PM.
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Ted
Hobie 16
South Carolina Lake sailing
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Posted: Jan 07, 2016 - 07:23 PM
40 grit is your friend -
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Posted: Jan 07, 2016 - 11:16 PM
I would use a side grinder with a 60 grit flapwheel to start.
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Greenville SC
Offering sails and other go fast parts for A-class catamarans
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Posted: Jan 10, 2016 - 08:15 AM
The obvious solution is to buy an F16! We've got a decent fleet of them where you race Ted.
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Mac
Midlands South Carolina
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Posted: Jan 10, 2016 - 09:38 AM
Removing the cured resin (aka concrete) is not really necessary, another solution is to add MORE filler on both sides and fair in a new profile for the bottom. Wet sanding will yield a nice fast profile that is also a great protective "bottom job." "Fairing in" is much easier and less damaging than removal in many cases.
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Posted: Jan 20, 2016 - 01:34 PM
Photos?
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Sheet In!
Bob
_/)_____/)_/)____/)____/)_____/)/)__________/)__
Prindle 18-2 #244 "Wakizashi"
Prindle 16 #3690 "Pegasus" Sold (sigh)
AZ Multihull Fleet 42 member
(Way) Past Commodore of Prindle Fleet 14
Arizona, USA
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