sanding for epoxy graphite

[brackish]

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]

I just went through this and believe me, I'm not the one to ask .

[Cracker Larry]

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.

[brackish]

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.

[tech_support]

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.

[terrulian]

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 . I think it just hates me.

[tech_support]

its not a top coat