Epoxy Primer
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Most epoxy primers are not intended to be sanded. There are hybrid ones that you can. Adding reducer will make it flow better but will not
change the way it dries or sands. If sanding is needed usually it is just a light sand and wet sanding is used. I don't like it done this way.
Usually if you need to do sanding, a urethane 2K primer should be applied over the epoxy during the window that it can be. You need to know
what the maker recommends for this.
Mikey
change the way it dries or sands. If sanding is needed usually it is just a light sand and wet sanding is used. I don't like it done this way.
Usually if you need to do sanding, a urethane 2K primer should be applied over the epoxy during the window that it can be. You need to know
what the maker recommends for this.
Mikey
It does say in the product description at Summit that the product is sandable. But given that it's a private label product I doubt if you'll find out any more than that.
SPI (Southern Polyurethanes) is one of the only sandable epoxy primers that's advertised as such and used that way. Even SPI says to use a urethane high build primer if you need material build up.
On the other hand, some well known epoxy primers like PPG DPLF are not really sandable and say so on their product sheets. DPLF is meant to be overcoated without sanding if within its time window. Beyond the time window, you scuff it with Scotchbirte or 220 grit on a DA before you spray over it.
SPI (Southern Polyurethanes) is one of the only sandable epoxy primers that's advertised as such and used that way. Even SPI says to use a urethane high build primer if you need material build up.
On the other hand, some well known epoxy primers like PPG DPLF are not really sandable and say so on their product sheets. DPLF is meant to be overcoated without sanding if within its time window. Beyond the time window, you scuff it with Scotchbirte or 220 grit on a DA before you spray over it.
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I have used it. You can recoat without sanding for up to 4 days @70 deg F. It will eventually dry enough to sand. I add about 10% Urethane-Grade Reducer and it flows better.
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I know with PPG epoxy you reduce it with acetone, up to 10%. If you do that, it sprays out nice. You have to wait about 4-5 days before sanding, if you absolutely have or want to. Sand it using very light pressure. Let the paper cut. If you apply pressure, it will just gum up the paper. Ideally, spray it on bare metal, then top coat with a good filler primer and sand that.
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In general, you shouldn't be spraying epoxy primer when the air temperature is less than 60 degrees.
From my experience on my '57 build, Nason Full-Poxy wet sands nicely.
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SPI epoxy is the way to go.
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I knew it was only a matter of time........😂
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I have used and sanded epoxy many times. It is no fun. With that, my last project I used SPI epoxy and will never use another epoxy now. It saves time and sanding paper.
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