Sanding primer?

• Dec 19, 2015

• #1

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drc270

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I am curious if there is a need to sand primer before topcoat. I have had many parts and the engine bay in primer for a few weeks.
Is there a "window" with primer or can I simply clean and shoot or do I need to create new mechanical adhesion???

 

• Dec 19, 2015

• #2

Homstead

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I would do some sanding. Some of the epoxy primers and sealers I have used had to be top coated within 7 days.

 

• Dec 19, 2015

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eric383

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X2, the epoxy primer I use has a top coat window of 7 days otherwise clean, scuff and shoot.

 

• Dec 19, 2015

• #4

ckessel

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PPG's DP series could be topcoated if you shot it within like 6 hrs time. After that you have to sand. Your stuff has been sitting for much longer. You must sand it or it will delaminate[peel] like you see on some vehicles. Think white paint on chevy's, fords, mopar etc trucks and cars.

 

• Dec 19, 2015

• #5

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drc270

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Thanks for the response guys. Hopefully the paint will be complete in the next month or so.