Follow these steps to get the most out of painting your concrete foundation. Step 1 – Prepare the Foundation. The first step before you paint is to clean the entire foundation. Step 2 – Prepare the Paint Equipment. Wash the roller with clean water to remove all the dirt and dust. Step 3 – Paint the Foundation. Click to see full answer. In this regard, what kind of paint do you use on concrete foundation? Prime the Concrete For exterior foundations and walls, use exterior-grade block filler, such as Behr’s Concrete and Masonry Bonding Primer, which also is good for interior concrete ($17.98 per gallon). Primer dries in two hours; wait at least eight hours, but no more than 30 days, to paint.One may also ask, should you paint a concrete foundation? Painting concrete walls It is not necessary to apply a sealer when painting the exterior concrete. However, it is advisable to apply a concrete primer (also called a block primer) that fills the pores and evens the surface. It usually dries within a few hours. Regarding this, how do you paint a concrete house foundation? How to Paint Concrete Foundations Remove old paint. If you’re repainting concrete, it’s probably because the old paint is chipping or peeling away. Clean the surface. Because of its porosity, dirt, grease, and other grime gets trapped in concrete over time. Make repairs. Seal and prime. Paint the concrete. Do I need to prime concrete before painting?For a clean and even coat of paint, your concrete surface will need to be thoroughly cleaned before primer is applied. Most primers will dry in a few hours, but home improvement professionals suggest waiting a full eight hours after priming before applying paint just to be sure.