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 Post subject: Bottom job - wear layer
PostPosted: Mon Jul 14, 2014 12:57 pm 
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Joined: Fri Nov 12, 2004 10:01 am
Posts: 76
Location: OC NJ
Does anyone have experience using Cabosil filler mixed in the resin on a bottom job?

I read that it 'sands like a brick'....Makes me think that it might reduce the wear from dragging.


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PostPosted: Fri Jul 18, 2014 4:10 am 
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Joined: Mon Jul 14, 2003 7:11 pm
Posts: 4641
Location: Detroit, MI
It's certainly harder than gel coat. But without a UV inhibitor, resin will yellow badly (even on the bottom). The pigment in gel coat serves this purpose.

If you don't mind the side effects, then it's OK.


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PostPosted: Fri Jul 18, 2014 7:37 am 
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Joined: Fri Nov 12, 2004 10:01 am
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Location: OC NJ
My thought was to gel over it...


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PostPosted: Fri Jul 18, 2014 8:16 am 
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Joined: Mon May 09, 2005 10:25 am
Posts: 2618
Location: Jersey Shore
If your hulls are worn down into the glass layers, then you should rebuild using glass fabric and resin. The glass is a structural material and if you rebuild the hulls with just resin (even thickened resin) it will not be anywhere near as strong as if you use glass too. Plus, using glass allows you to much more easily build up the thickness. Without glass, the thickened resin will be a mess to work with and very difficult to build up a consistent thickness.

sm


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PostPosted: Fri Jul 18, 2014 9:13 am 
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Joined: Sun Dec 23, 2007 1:20 pm
Posts: 217
Location: Panama City Beach, FL
Although my hulls are painted with a urethane light blue, I have a black (racing stripe) on the bottom edge of them to protect them from the sand. I used layers of fiberglass cloth and resin similar to: "The Bottom Job - This Old Hobie" by Rick Buchanan on pages 12 & 13 of the Sept/Oct 2008 Hotline.

http://www.w1dm.com/projects/hotline/08-09-10%20HOTLINE.pdf

Instead of putting on a final coat of gelcoat, I used more resin with West System 423 graphite powder. It helps the hulls to slide better over the sand and gives a shiny black protection strip.

If you ever painted your hulls with any color other than the original gelcoat white, you will be able to easily tell where you need to protect the bottoms of the hulls (and paint) from the sandy beaches.


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Tim
82' H16
Sail # 88863
Panama City Beach, FL
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PostPosted: Sun Aug 17, 2014 6:42 am 
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Joined: Fri Dec 28, 2007 11:23 am
Posts: 564
Location: Lake Norman NC
smear on a layer of marine tex on the wear layers this is quick easy and works great
former hobie admiral gary


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