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ANSWER:

Usually it is just the patched areas that require primer. The primer’s role is to seal the area and ensure that the patch will hopefully look like the rest of the wall once it is painted. Skipping the primer often gives the patched area a different texture, which can make it more noticeable. Depending on the color and age of the paint, however, sometimes the only way to get a patch to disappear is to paint the wall in its entirety.

Expert's Bio

Charles Bull manages a design build construction company in Toronto, Canada, spending his days looking into everything from permits to the latest green building methods. With more than 15 years of experience in residential real estate, construction and renovation under his belt, Charles knows the answers to your home renovation queries — or will find them out if he doesn’t!