How to Seal a Concrete Planter

What You'll Need
Warm water
Liquid soap
Spray bottle
Concrete sealer
Small tarp
Expendable towel
Scrub brush

A concrete planter can spruce up virtually any yard or garden and is a very secure structure in which to house your plants. To maximize its life and protect it from the elements, it is recommended that you seal your concrete planter.

Step 1 - Give Your Planter a Thorough Cleaning

Before proceeding to apply your sealer, you will need to vigorously clean your concrete planter. First off, you'll need to produce a simple homemade cleaning solution of mild liquid soap and warm water inside of an empty spray bottle. Once the necessary ingredients have been combined, seal the bottle and shake thoroughly. Next, spray down every area of your planter, paying special attention to any noticeably filthy areas. Once your cleaner has been applied, use a scrub brush to purge any caked-on dirt, debris or grime. After your planter has been sufficiently cleaned, use a garden hose to rinse off your homemade cleaner, then allow the planter to air dry.

Step 2 - Seal Your Planter's Exterior

Now that your planter is nice and dry, it's time to apply your first coat of sealer. Place the planter on top of a small tarp or an expendable towel, then turn it upside down. Next, use a paintbrush to apply the concrete sealer to the planter's exterior in broad, even strokes. If birds, squirrels, pets and other animals frequently come into contact with your planter, it is strongly recommended that you use a non-toxic concrete sealer for this task. Once the exterior has been successfully sealed, place the planter in your garage, basement or any other safe, well-ventilated location and allow it to dry overnight.

Step 3 - Seal Your Planter's Interior

Once your first coat of sealer has had ample time to dry, you'll be ready for the final step. Restore your concrete planter to its original position and proceed to apply a coat of sealer to the planter's interior, once again making sure to use broad, even strokes. After the sealer has been applied, allow it to dry overnight, as outlined in the previous step. If you wish to apply any additional coats of sealer, simply repeat steps 2 and 3.