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 Post subject: Dynel cloth or graphite?
PostPosted: Sun Dec 04, 2011 5:05 pm 
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Joined: Wed Sep 21, 2011 3:58 pm
Posts: 19
I'm at the point now that I need to order my fiberglass. I plan to glass inside and out instead of taping.
I was on Duckworks site and they have dynel cloth to improve abrasion resistance. Any one have any experience with this?
I'm building the touring pirogue T that will mostly be used in a river that has a lot of shallow rocky sections, potentially going over a lot of logs and rocks and being pulled up onto rocky shores.
I was planning on graphite, though I don't really like the look of it. Does any one know does dynel wet out clear? How does it compare to graphite for abrasion resistance?
Thanks a lot,

Chris


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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Sun Dec 04, 2011 5:42 pm 
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Joined: Fri Jun 18, 2004 8:14 pm
Posts: 4855
Location: Greensboro, NC
It work much like e-glass ("normal" fiberglass). But it swells as it absorbs resin. It's preferred to be used with vacuum bagging.

You can lay it up by hand but be aware of the swelling issue. As a wear strip, shouldn't matter but do a test piece first.

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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Sun Dec 04, 2011 6:34 pm 
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Joined: Wed Sep 21, 2011 3:58 pm
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Thanks for the reply. Do you know how it compares to graphite for abrasion resistance?
Thanks,

Chris


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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Sun Dec 04, 2011 8:14 pm 
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Joined: Wed Feb 21, 2007 10:48 pm
Posts: 988
Location: Tx
Everyone I have talked to says they will never use it again.
Ron


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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Sun Dec 04, 2011 9:00 pm 
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Location: Greensboro, NC
The graphite helps make the surface more slippery and deflects the things that dig into the hull. I don't know which is more abrasion resistant.

For the trouble, you might be better off just doubling up on strips of e-glass or add some wood runners.

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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Mon Dec 05, 2011 5:07 am 
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Joined: Wed Sep 21, 2011 3:58 pm
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tx river rat wrote:
Everyone I have talked to says they will never use it again.
Ron

that's good to know


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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Thu Dec 08, 2011 6:28 pm 
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Joined: Wed Mar 30, 2011 7:20 am
Posts: 374
Location: Adelaide, South Australia.
puddy wrote:
Thanks for the reply. Do you know how it compares to graphite for abrasion resistance?
Thanks,

Chris


I coated the bottom of my yak with epoxy/graphite. At first I wasn't sure if it was any more scratch resistant than ordinary epoxy, but after a couple of weeks I am now convinced. It does seem to take a bit longer to cure to maximum hardness than straight epoxy, but once hardened it is fantastic.

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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Wed Feb 08, 2012 4:05 pm 
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Joined: Mon Sep 12, 2011 6:29 pm
Posts: 138
Location: Chicago
That guy at http://tomangelakis.tripod.com/graphite_bottom.htm (cited in a graphite thread in the Tips and Tricks section,)
he mentions an ongoing nuisance of the graphite rubbing off on hands, clothing, etc,

anyone have a remedy for that?

Thanks.


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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Wed Feb 08, 2012 7:02 pm 
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Joined: Fri Feb 25, 2011 4:26 am
Posts: 133
Location: Fraser Coast, Queensland, Australia
Quote:
That guy at http://tomangelakis.tripod.com/graphite_bottom.htm (cited in a graphite thread in the Tips and Tricks section,)
he mentions an ongoing nuisance of the graphite rubbing off on hands, clothing, etc,


G'day les,

I think that bloke is talking through his bum. Either that, or he might have put waaaaay too much graphite in his epoxy. I use about 20% by volume of graphite to the mixed resin and have never had any problem with the black stuff rubbing off on me. it sets as hard as a rock.

The bottoms of my boats get an awfull flogging on rocks, gravel, logs and the like, even barnicles and oysters at times and the graphite mix works a treat for me.
:D
Image

Image

Image

and the worst is a few scratches on the bottom :D

Image

that another layer of graphite easily fixes. :mrgreen:


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 Post subject: Re: Dynel cloth or graphite?
PostPosted: Wed Feb 08, 2012 7:22 pm 
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Joined: Mon Nov 12, 2007 8:12 am
Posts: 192
Location: S.E. Queensland
Reckon this would be an issue only if the graphite/resin surface was sanded. Why sand back a protective layer? Never had it happen to me.
Cheers John.


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