What is paint primer and what does it do? Here's exactly what paint primer does, when you should use it before painting, and when you can skip this step.
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What is Primer Paint? Why is It Important?
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What Is Primer Paint and How to Apply It to Your Car - Haynes Manuals
Do I need a second coat of primer on my dark purple walls? (You can see original color at top edge that needs to be finished still) : r/paint