Primer question posted by Bigmatthew86 on August 12, 2017 at 09:10 AM
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What exactly do you mean by "2k primer"? That usually refers to a 2-part epoxy (like a DP-40) which is exactly what you want to put over bare metal to protect and seal it. However that should be sanded before final coat is laid down and you want to make sure it is not rubbed through to bare metal.
Bottom line is you need to read the information that comes with the product (online or sheet from paint store).