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Re: painting over 5 year old epoxy
Sinces your epoxy primer is 5 years old it's possible there may be rust under it
Epoxy primers that use zinc phosphate as an anti-corrosion device are sacrificial. Knock it down with 180, you'll probably go down to bare metal in certain spots, apply at least two coats of your anti-corrosive epoxy and follow it up with your surfacing epoxy and you should be good to go
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