sanding for epoxy graphite

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brackish
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sanding for epoxy graphite

Post by brackish » Wed Oct 29, 2014 5:49 pm

What is the appropriate final sand grit number before applying epoxy graphite? The substrate is coated with Interlux epoxy primecoat. There are a very few final fairing spots less than a couple of inches in diameter done with Quick Fair and I don't plan to do another coat of primer because of them. The interlux instructions talk about prep for their finish coats but not epoxy/graphite.

I'm ready to go with this, need to get it done before cold sets in. FS14 is the boat.



terrulian
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Re: sanding for epoxy graphite

Post by terrulian » Wed Oct 29, 2014 8:46 pm

I just went through this and believe me, I'm not the one to ask :doh: .
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Cracker Larry
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Re: sanding for epoxy graphite

Post by Cracker Larry » Wed Oct 29, 2014 8:54 pm

I've never used that primer, but I'd probably use 120 for that. 80 would be OK too. The epoxy/graphite will fill 80 grit just fine. I've used both, no real difference.
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brackish
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Re: sanding for epoxy graphite

Post by brackish » Thu Oct 30, 2014 9:15 am

Thanks. One additional question. The recommended ratio's of graphite powder to epoxy resin, are they by weight or volume? I would think volume given the light weight of the powder, but thought I'd ask.

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Re: sanding for epoxy graphite

Post by tech_support » Thu Oct 30, 2014 9:20 am

brackish wrote:Thanks. One additional question. The recommended ratio's of graphite powder to epoxy resin, are they by weight or volume? I would think volume given the light weight of the powder, but thought I'd ask.
I recommend 15 to 20 percent max.

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Re: sanding for epoxy graphite

Post by terrulian » Thu Oct 30, 2014 9:56 am

Maybe that was part of my problem. I had heard as high as 30% and ended up using 25%. But here's an odd thing: in the bottom of the pot, which CL had recommended we not use so that the lumpy stuff would settle there, it dried smooth as glass :cry: . I think it just hates me.
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Re: sanding for epoxy graphite

Post by tech_support » Thu Oct 30, 2014 10:01 am

its not a top coat :!: :D

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