Epoxy

[CarsonsChaos]

I know that epoxy isn't a fill and sand primer.
I sprayed a tank with Nason Fulpoxy.
24 hour later in a few spots that i sanded through, I can
scrape it off with a finger nail.
That's not normal is it?
I stripped the tank with a DA and 220 grit.
I cleaned it, sprayed it, left it for 24 hour at 70 degree.
The rest of it seems to be rock hard, only at the sand through can I scratch it off.
491-16 Nason.

[Cowboy]

CC, I,m not familiar with that brand. But is it a sandable Epoxy ? & I assume it,s a 2 part epoxy The ones I,ve use don,t require sanding. sounds like that might be Yer problem. & in My opinion 220 grit is not much bite for bare metal . I,d never go less bite than 120 . Cowboy

[Stang]

Sounds like oil to me. I don't think the grit would be a problem. I would just feather out the area, clean it and hit it again and see what happens. you might have missed a couple spots cleaning and the primer reacted with it.

[CarsonsChaos]

OK. I took it back down to the metal with 80.
layed on some epoxy.
My next question is what grit can I get away with between
coats of epoxy.
Since all I have is a tank and 2 small side covers
and the tank is pretty straight.
And I have a a half gallon between epoxy and activator,
I'm going to use it to prep them for paint.

[Cowboy]

Sorry I dont know what Yer trying to do. #1 ,if its a nonsanding epoxy, WHY do you want to sand it ? It is designed to properly cover bare metal & make a proper surface to lay Yer Uro primer on top of, Then You block sand that primer to fix the imperfections. if needed after sanding then recoat with the primer. & block again . I Hope this make sence . Cowboy

[CarsonsChaos]

I guess what I need to know is, the epoxy has sat for a week or more.
What grit do I need to hit it with before going over it with either another epoxy coat.
Or as yo said, a Uro primer.
By the time I get back to it, it's going to be outside the window of wet to wet application.
I thought if it blocked out OK that I may not need to use a Uro primer.
Then I'd go with a light or thinned coat of epoxy right to base.
It probably shows, this is the first time I've shot an epoxy primer.

[Clinton]

You can't block out Epoxy, for one it should be as hard as a stone to sand if it's fully cured. And if it's not fully cured it'll be tacky, and in that case you should be fine to coat. If it is fully cured just scuff it with some 240-320 or so and topcoat it with a high build primer.

[Cowboy]

Do Exactly like Clinton said, Bud. And the epoxy,s are not designed to be painted directly on , therefore the need for the uro primer. good luck. Cowboy