Pinhole factory

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fallguy1000
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Pinhole factory

Post by fallguy1000 » Sat Jul 11, 2020 2:21 pm

Check this out guys.

My homemade fairing mix.

And no, it is not too dry.

It is 480g epoxy, 25g cabosil, 75g sil32 balloons

I am prefilling these holes with Quikfair before I sand and fill them with dust.
5A479E26-2DA2-4BF3-9FC6-C73C3FC77B27.jpeg


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Dougster
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Re: Pinhole factory

Post by Dougster » Sat Jul 11, 2020 4:33 pm

8O Good lord you must feel like Job! Never have seen anything like that, but all I've ever used is the Bateau fairing mix and quickfair. Great thought on filling before sanding. I fought pinholes on all my 3 builds. Best thing I found was an automotive product I've touted on the forum before: Kombi's Super Putty. Put a bit on my finger, smear over pinholes, sand off in 5 minutes. Leaves a rust colored patch that needs primer though. That's just for the few tiny pinholes, not that factory!

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BrianC
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Re: Pinhole factory

Post by BrianC » Sat Jul 11, 2020 4:37 pm

More like fairing foam :help: at least it must sand easily, it’s half air!
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Jaysen
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Re: Pinhole factory

Post by Jaysen » Sat Jul 11, 2020 5:11 pm

I know you said it is not too dry, but I Only saw that when I made it ... too dry. Specifically too much cabosil. I don’t measure like you do (because lazy) but I would say I was closer to 1:10 cab to balloon and then 1/4c mix to 2oz epoxy. It was closer to peanut butter (glue) than frosting (fairing) but sanded super easy.

I should really measure this stuff in the future.
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BarraMan
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Re: Pinhole factory

Post by BarraMan » Sat Jul 11, 2020 10:37 pm

I used West System epoxy and West System fairing compound. Never saw anything like that and never has a issue with pinholes!

fallguy1000
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Re: Pinhole factory

Post by fallguy1000 » Sat Jul 11, 2020 11:19 pm

BarraMan wrote:
Sat Jul 11, 2020 10:37 pm
I used West System epoxy and West System fairing compound. Never saw anything like that and never has a issue with pinholes!
Just tryin to save a grand.
My boat build is here -------->

viewtopic.php?f=12&t=62495

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BarraMan
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Re: Pinhole factory

Post by BarraMan » Sun Jul 12, 2020 12:45 am

fallguy1000 wrote:
Sat Jul 11, 2020 11:19 pm
BarraMan wrote:
Sat Jul 11, 2020 10:37 pm
I used West System epoxy and West System fairing compound. Never saw anything like that and never has a issue with pinholes!
Just tryin to save a grand.
I understand - but what’s the labour investment to fix that?

fallguy1000
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Re: Pinhole factory

Post by fallguy1000 » Sun Jul 12, 2020 1:29 am

BarraMan wrote:
Sun Jul 12, 2020 12:45 am
fallguy1000 wrote:
Sat Jul 11, 2020 11:19 pm
BarraMan wrote:
Sat Jul 11, 2020 10:37 pm
I used West System epoxy and West System fairing compound. Never saw anything like that and never has a issue with pinholes!
Just tryin to save a grand.
I understand - but what’s the labour investment to fix that?
Probably take me a couple hours to go around and fill. I think the others will hole a bit as well when deep.

But I would like to know a better recipe. If I go wetter; it will like to sag and gets harder to sand. But probably a must from here forward. Can't keep having it. Good news ia fills get less and less.
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BB Sig
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Re: Pinhole factory

Post by BB Sig » Sun Jul 12, 2020 6:47 am

It would seem to me that you have some sort of contamination in your garage. First it was fisheyes in paint and now in your fairing mix.

Do you have a fuel can in the garage that is older? One without the environmental crap that spills more fuel? The fumes could be depositing droplets onto the surface when it gets hot. Could also be a piece of equipment.

Shot in the dark...

fallguy1000
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Re: Pinhole factory

Post by fallguy1000 » Sun Jul 12, 2020 9:14 am

BB Sig wrote:
Sun Jul 12, 2020 6:47 am
It would seem to me that you have some sort of contamination in your garage. First it was fisheyes in paint and now in your fairing mix.

Do you have a fuel can in the garage that is older? One without the environmental crap that spills more fuel? The fumes could be depositing droplets onto the surface when it gets hot. Could also be a piece of equipment.

Shot in the dark...
Thanks Barry. It is something the fillers are doing. Drywall mud will pock as well. Guys put soap in the mix to make it flow better and not pock.

If I increase the epoxy amount; it just wants to sag and gets harder to sand both.

It fills nicely when I go over it again. Gonna start after breakfast.

My mix needs some kind of flow agent like a latex I'd say. There is some humor in the soap idea.

That boat makes bubbles everywhere it goes!
My boat build is here -------->

viewtopic.php?f=12&t=62495

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