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Old 04-17-2011, 10:58 AM
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High build vs epoxy primers

Well here's the deal. MY fox was sanded down so that there was a lot of bare metal spots showing. I was told that a 2k high build primer would work for me(it is great and fills in A LOT) so that's what I got. I'm getting some light surface rust under the primer in a couple of spots and now people are telling me that I should have gotten an epoxy primer. I don't drive the car in primer and it hasn't been outside in any kind of rain or snow, so maybe the primer was just really thin in those spots? Did I really screw it up? Should I get some epoxy primer and just put it over the top of the 2k that's on it now or would a primer sealer over the 2k suffice?

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Old 04-17-2011, 11:30 AM
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you must have primed over rust to begin with unless it was sitting outside but that doesn't sound like the case. Sounds like you just primed over rust. I'd strip it and ensure the surface rust is completely gone. Then I'd either hit it with a 2k, or epoxy and let it semi cure and THEN 2k it. Epoxy is more dense and sticks better. It holds out rust for longer and provides the best adhesion to bare metal you can get. Just not fun sanding it but it provides a great cross link cure with a 2k and so you don't necessarily have to sand on it.
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Old 04-17-2011, 12:26 PM
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Sand it all down to bare metal. Get yourself a gallon of epoxy, shoot it over bare metal and then you can do your bodywork/2K Hi-Build primer over it.
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Old 04-18-2011, 07:26 AM
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Use SPI epoxy and it will sand much easier than mot other epoxys
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Old 04-18-2011, 07:36 AM
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Quote:
Originally Posted by Old Fool
Use SPI epoxy and it will sand much easier than mot other epoxys

Then apply your 2K over the epoxy. Any areas where you sand through to bare metal should be spot primed with epoxy.

Vince
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Old 04-18-2011, 07:56 AM
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many 2k urethane primers will soak up water like a sponge. main reason i stopped using them. if you need fill go to one of the evercoat poly high builds.
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