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Looking for advice for spraying epoxy primer over e-coat. This is for the interior of a quarter panel replacement, so it doesn't have to be show quality. It just needs to protect from rusting up again. I've tested the e-coat with some xylene and nothing came off so I'm assuming it's good e-coat. My plan is to scuff with the maroon scotch brite pad and then spray it after cleaning. I saw somewhere that sanding paste is recommended as an intermediate step. I've never heard of the stuff until now and I'm wondering if it's necessary. Any tips would be welcome.
 

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Sanding paste is more for production shops who don't want to spend a lot of time with the scuff pad. It's kind of like using two scuff pads at once.
As long as you knock the shine off the Ecoat, it will be just fine. The red scuff pad does a good job!
 

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The Penny Pincher
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I use the sanding paste on "used" items, it's great for cleaning it as well as sanding and
because you wash it away.
For a new item that's clean I use the scuff pad dry because I can see what I'm doing better
and keep it dry. Either way, the scratch is ample when done thoroughly.
 
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