When Do You Need To Use Primer On Walls. Applying paint primer to a wall will help to create a better finish for the top coat as well as keep it lasting a much longer period of time. The benefits of primer is to solve common painting problems including stains on walls, moisture damage, old painted surfaces, odours, colour changes, and new exterior woods.
How much primer you need will depend on the material and condition of your walls if you're using paint primer on a wall in good condition, and you're not changing finishes or making a drastic color change.
Larger projects, such as walls or fences, need a. While priming is usually the best if your walls are perfectly clean and in good condition, you might be able to eliminate the need for primer. Use a paint roller and paint pan when a paint sprayer is not available. Why are you using a primer?