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Discussion Starter · #1 ·
Painting a semi cab that is mostly aluminum and it was sugested that I use omni polyester primer over the aluminum panels but use omni mp 170 over the bare steel parts first. What I need to know is if I spray the polyester primer over the mp 170 after it has sit for 24 hrs do I need to sand the 170 first or can I just spray it without sanding?
 

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Discussion Starter · #3 ·
The primer came from the local auto parts and the guy who sold it to the truck owner didnt know much about it. There are no full-time paint stores close by and that has always been a problem here. Thanks for the info:)
 
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