SailNet Community - Reply to Topic
Thread: Fairing Compounds, what do "you" use? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
12-28-2013 08:07 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 11:01 AM
Re: Fairing Compounds, what do "you" use?

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 10:12 PM
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 09:22 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 09:05 PM
Re: Fairing Compounds, what do "you" use?

Fairing your keel on Christmas eve - a new definition of hard core.
12-24-2013 07:24 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 06:38 PM
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 06:07 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 10:41 PM
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 10:11 PM
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.
This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

For the best viewing experience please update your browser to Google Chrome