Masonry Spray Paints If you want to spray paint a concrete plant pot, make sure you choose a spray paint labeled for masonry, which adheres to the concrete more effectively than standard spray paints. Do not spray paint the concrete plant pots while they have plants inside of them.Click to see full answer. Just so, what kind of paint do you use on concrete planters?Artsy Expressionist. You can buy a specially formulated acrylic paint made to withstand outdoor weather conditions. It can be applied to concrete, making it an ideal medium to use for an artistically updated concrete planter. what kind of paint do you use on flower pots? acrylic paints Simply so, how do you paint outdoor planters? #1 Prep your planter surface before painting it. Gently rub a little sandpaper over a shiny surface to give the spray paint something to adhere to. Next, wipe the outside of your planter down with TSP (tri-sodium phosphate) and a lint free cloth or rag to de-gloss and de-glaze your surface before painting it.How do you seal concrete flower pots? Properly treating then sealing the concrete planters ensures your plants remain healthy. Set the planter outside for two weeks prior to planting. Mix 1/4 cup vinegar and 1 gallon of water. Paint the inside of the planter with concrete sealer. Fill the container with a well-draining potting mix and replant.