Is two coats of primer too much? Depending on how strong or bold the previous color is, it may be necessary to apply more than one coat of primer. However, it is not necessary to over apply the primer with so many coats. As long as the primer applies uniformly over the previous color, then one or two coats should be sufficient.
Is it better to primer twice or paint twice? You’re painting unfinished drywall or plaster.
Two primer coats are recommended in this scenario because much of the first primer coat will be soaked up by the wall; the second coat will replenish any primer absorbed by the surface and hide any flaws in the wall.
How long should you wait between two coats of primer? Adding a Second Coat
A good rule of thumb is to wait at least three hours to recoat your paint or primer if it’s water-based. Waiting 24 hours is best for oil-based paint and primer.
Can you use too many coats of primer? Too much primer causes a different set of problems. Too many layers or an excessively thick layer increases the risk of the primer cracking, crazing, or chipping. It also takes longer to dry, slowing down your redecorating work. In the worst case scenario, it can damage drywall by causing it to bubble and peel.