Nothing physical - they are both fine, what they are meant for is to give a way to check if there are waves in the surface - spray a thin coat of gray and then a thin coat of red/brown - when you sand it out, they will show you where the surface irregularities are.
Andrew
Iowa883 wrote:
What is the difference between the gray machine primer and the red/brown oxide primer ? What is each used for ? Thanks, Iowa883
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