When you go to paint a wall, whether interior or exterior, you'll usually apply a paint primer before you start adding your new color. Here are a few reasons primer is an important step.

Paint Lasts Longer
Primer is made to help your wall color last longer. It acts as a barrier between the paint and the wall or surface you're painting and helps paint adhere to the walls. This can help preventy cracking, peeling, or bubbling.

Paint Looks Better
The color stands out more and is truer to its original shade when painted over primer. Primers are usually white or a soft neutral color and hides the previous colors so it's like painting on a blank canvas. A soft yellow will look much better painted on a white surface than a darker or unfinished one.

Paint Is Smoother
Primers help fill in small cracks and holes or cover up any bumps on the wall's surface. The paint will look more seamless and won't settle into lines on the wall.