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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Fairing Compounds, what do "you" use?
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Topic Review (Newest First)
12-28-2013 09:07 PM
Dog Ship
Re: Fairing Compounds, what do "you" use?

After two days my sample in the carport had finally kicked off so I let it sit one more day and went back down to the boat.
Like I had expected it had sagged quite badly. So after "much" sanding I mixed up some more.
With SJ34's advice of a 2:1 mix in mind I added much more filler than the first time. Not quite a 2:1 but close. It looked like pie dough as opposed to my first attempt, thick icing.
I have worked with epoxy quite a bit over the years and during first attempt I had "epoxy" in mind and tried to keep the epoxy, well epoxy looking.
Big mistake.
After a huge amount of sanding I mixed up my new brew at about 1 part epoxy to 1.75 parts filling compound. It went on like drywall filler and stayed put, no sagging. Perfect!
All I have left to do is sand the old paint a bit and put on some new bottom paint . Then wait for the boat yard employees to return from their Christmas break so they can put the old tub back in the chuck.
Thanks for all the help everyone.
12-25-2013 12:01 PM
christian.hess
Re: Fairing Compounds, what do "you" use?

Quote:
Originally Posted by SloopJonB View Post
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.
thats what we have been using down here in el salvador...great cheap stuff and is nice to fair....we are using this method outside and to fair the insides of the cabin tops where they meet the deck as they had loose strand oem glass work
12-24-2013 11:12 PM
Rhapsody-NS27
Re: Fairing Compounds, what do "you" use?

I just used West System epoxy with some 407 filler to do some fixing on a tiller. Working on re-varnishing it too. I like how this filler worked out on this project.
12-24-2013 10:22 PM
Dog Ship
Re: Fairing Compounds, what do "you" use?

Well, it was a nice day and race season starts January 6th.
12-24-2013 10:05 PM
SloopJonB
Re: Fairing Compounds, what do "you" use?

Fairing your keel on Christmas eve - a new definition of hard core.
12-24-2013 08:24 PM
Dog Ship
Re: Fairing Compounds, what do "you" use?

West's 407 is the same stuff as what I used, except I used a generic brand that was a tenth of the cost. I got a gallon of it for $11 as opposed to $34 for a litre of 407.
12-24-2013 07:38 PM
SJ34
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.
12-24-2013 07:07 PM
Dog Ship
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.
12-14-2013 11:41 PM
Stumble
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).
12-14-2013 11:11 PM
SloopJonB
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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