All about Paint and Primer You may need to know what a primer is and what it does before talking about the time people need to use a primer on your next interior wall painting project. So, what is a primer, and what does it do? Primer and Its Functions Though primer has a higher concentration of solids plus an adhesive binder in it, it looks like paint. You can use it to provide a smooth and clean area for the paint to adhere to, and it essentially seals the surface. In many cases, primers are more of glue or sealant than paints. Learn more here. When to Prime Your Walls before Painting? You have a few situations whereby you will always want to prime before painting, including: When the Surface is stained It is essential to prime first if your walls have any stains on them like kid art projects, candles, cooking, or smoke stains. The primer will seal these stains to show or leak through the paint since it acts more like a blocker or sealant. Learn more about What You Can Expect fro