Fairing Compounds, what do "you" use? - Page 2 - SailNet Community
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post #11 of 26 Old 12-14-2013
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Re: Fairing Compounds, what do "you" use?

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Originally Posted by Dog Ship View Post
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I really don't like dealing with WM but G-Flex seems to be the stuff for this application. There are no divots or holes that need filling it's just going to be a very thin filet along the hull to keel joint.
......
West Systems G Flex is not 'affiliated' with West Marine... and in any case WM in Vancouver couldn't/wouldn't stock G flex.. I found it at Steveston Marine after WM said they weren't allowed to import it????

So unlikely you'll find it at WM anyway..

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post #12 of 26 Old 12-14-2013 Thread Starter
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Re: Fairing Compounds, what do "you" use?

I picked up some G-Flex resin at Industrial Plastics and Paint. I also picked up 4 litre's of low density filler to stretch it out a bit and make it easier to work with.
It will kick off so long as it is not freezing outside. At 5c it will take 4 times longer to set than at 15c, it's minimum required temperature. It is unaffected by moisture or the humidity.
Ideally I should build a tent and put a heater in it but really, that would be a lot of work and being right beside the ocean and in the wind I can't see a big gain in temperature by doing that. I have some time.
The local racing season doesn't start until January 6th.
Thanks for all the idea's and Merry Christmas everyone.

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post #13 of 26 Old 12-14-2013
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Re: Fairing Compounds, what do "you" use?

Sanding watertight wasn't bad, no worse than anything else I had to sand.

If I had to do any heavy fairing I'd have used microballoons as well...

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post #14 of 26 Old 12-14-2013
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Re: Fairing Compounds, what do "you" use?

On the advice of an old boatyard owner, I use talc as a thickener for epoxy to make fairing goop. Balloons makes nice sanding but it stays so runny that it's hard to work overhead or vertically.

Talc/epoxy can be thickened as stiff as you need and it sands better than anything I've ever used. I find there's no need to worry about the talc being hygroscopic as there is so much resin in the mix plus the top coats that any theoretical absorbency isn't a factor.

It's dirt cheap too if you get it from an industrial supplier. I paid $20 for a cement bag of the stuff 10 years ago - I still have lots.
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Re: Fairing Compounds, what do "you" use?

Sloop THAT'S a good alternative to balloons!

By the way that gray was interprotect 2000e on mine so I did barrier after as well, to make sure the boat bottom is sealed.

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post #16 of 26 Old 12-14-2013
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Re: Fairing Compounds, what do "you" use?

You can make balloons as thick as you want, just add more to the mix.

Talc works fine, It is just not recommended for use below the waterline.

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Re: Fairing Compounds, what do "you" use?

I found I couldn't add enough balloons to stop it slumping. I finally resorted to adding some cabosil just to stiffen it.

I admit to some initial concerns about the talc underwater but the old boatyard owner who told me about it had a lifetime of building & working on boats so I tried it.

Never had a problem.

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post #18 of 26 Old 12-14-2013
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Re: Fairing Compounds, what do "you" use?

To each their own, but even the talc manufacturers won't recommend it for use below the waterline (on wet sailed boats at least).

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post #19 of 26 Old 12-24-2013 Thread Starter
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Re: Fairing Compounds, what do "you" use?

I managed to get the keel faired today.
We are having some pretty nice weather here when you consider it's December 24. It was 9C down at the boat.
I bought some G-Flex and some Pro-fil filler. Wasn't to sure how much filler to put in the brew but I did get it pretty stiff, kind of like thick icing. Although, given the temperature it did start to sag a bit before it kicked off. I managed to keep it under control but it will need some sanding and another application.
So far so good.

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post #20 of 26 Old 12-24-2013
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Re: Fairing Compounds, what do "you" use?

Microspheres and cab-o-sil in about a 2:1 ratio with your favorite epoxy. The cab-o-sil (fumed silica) is the thickener and makes the epoxy very hard (nearly as hard as neat epoxy) if used alone. The microspheres make it sandable but makes the epoxy weak in too large a ratio. For large fairing jobs you can increase the spheres to ease sanding.

I used this method to fair a very bumpy Cal 25, my San Juan 34 after a complete blister peel and several other smaller projects.

I've used West's 407 and 410 fillers with good results on small projects but they are very pricey.

I buy my fairing supplies from Aero-Marine for less than I can at WM even with my Port Supply discount.
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