My Graphite Epoxy Bottom Mix

Questions about boat repairs with our resins and fiberglass: hull patches, transoms and stringers, foam, rot etc.
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Capt UB
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My Graphite Epoxy Bottom Mix

Post by Capt UB » Mon Mar 26, 2018 3:25 pm

My mix as follows: 8 oz of resin and 4 oz. slow hardener, then 1/2 cup of graphite power.

What I used;
BBC's
Graphite
MarinEpoxy with slow hardener

What I did;
Shifted graphite a few times.
Mixed epoxy and hardener.
Added graphite slowly as I mixed.
Rolled on slowly.
Wet on wet, 1/2 to 1 hour between coats.
Did not sand at all.

I guess we shall see if this holds up. So far, I dropped the boat on it's transom (no skig), hard!
Nothing cracked or chipped off! Also, it's very slippery!


FS14 (SandPiper) launched 10/20/2018
LM18 on hold till cooler weather
NC16 build starts 11/3/2018

Backcountry
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Re: My Graphite Epoxy Bottom Mix

Post by Backcountry » Wed Sep 19, 2018 9:11 pm

In just a few weeks, I'm planning on doing the exact same to my old '86 Gheenoe. I'm curious, how's it been holding up?

cracked_ribs
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Re: My Graphite Epoxy Bottom Mix

Post by cracked_ribs » Wed Sep 26, 2018 10:37 pm

That's about what I do, except my mixing order is quite different.

I heat up just the resin to hot tap water temperature and mix the graphite into that, then let it cool down to room temperature. Heating the resin makes it really thin and I don't have to sift anything; the powder mixes really easily and all the bubbles migrate out as it cools.

Then I mix in the activator and spread. Super easy. Wears well. Comes out pretty smooth. You can see the reflection isn't super distorted in this pic.

Image

Fuzz
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Re: My Graphite Epoxy Bottom Mix

Post by Fuzz » Wed Sep 26, 2018 11:29 pm

Beautiful looking graphite job :!: I have no idea how you get away with doing it in the house :doh: I would get shot :help:

cracked_ribs
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Re: My Graphite Epoxy Bottom Mix

Post by cracked_ribs » Thu Sep 27, 2018 1:33 am

I believe my wife was initially attracted to me partly because I have a rebellious streak a mile wide and I can't really be told what to do.

I'm sure it seemed like a good idea when she was in her early twenties.

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Re: My Graphite Epoxy Bottom Mix

Post by R00kie » Thu Sep 27, 2018 3:20 pm

I did an experiment today using the approximate ratio provided by Cracker. I upped the graphite just a tad, (2.5 tablespoons/3 oz. mixed epoxy) at room temperature. Rolled one coat with Marineepoxy and a different coat using Silvetip. Both applied using West System foam rollers. The Silvertip batch was much smoother. Still not spray quality but acceptable to me for the expected abuse this hull will see. I have been taking lots of photos of the build (FS12 for my godson/nephew). I'll try to do a one shot build thread after it is proven to float. That way, no one can tell me that what I am doing won't work

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Re: My Graphite Epoxy Bottom Mix

Post by Jeff » Thu Sep 27, 2018 3:46 pm

Nice ROOkie!! Jeff

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OrangeQuest
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Re: My Graphite Epoxy Bottom Mix

Post by OrangeQuest » Thu Sep 27, 2018 5:20 pm

Wow, that looks like black paint!

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