It's always best (for the best quality) to paint with primer
first, then your regular coat of paint. Let the primer dry
sufficiently.
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No you can not use primer as your paint because it has no
sealing properites in it.
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Paint primer is essential for many projects. If primer is
sprayed onto the surface before painting, it will allow the paint
to better adhere and create an even surface.
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Yes, you can because brown primer isn't that dark of a
color.