Driveway paints that contain some proportion of silicone or a silicone derivative are meant to seal the surface of the driveway, while providing an attractive finish. Because silicone is UV unstable, it can break down over time, which means your driveway may discolour, or it may not be as protected from the elements. Refinish the driveway to bring back its looks and protection by following the right protocol for your siliconised paint.
Determine What’s On It
Before you begin painting your driveway, it’s a good idea to find out what was used on it originally. See if there’s a can of the original paint in the driveway or contact the company that applied it to help you determine your next best step. True silicone paint seals well, but is only temporary on outdoor concrete because it breaks down easily. If you have silicone paint, power washing it may be all you need to do to prepare the driveway. If you have a silicone blend, however, like silane, silate and siliconate, all of which are blends of silicone with additives, you may need to sand down the current paint before continuing.
If you have a silicone blend, or you are unsure of what your concrete is covered with, you will have to sand it down before painting. A hand sander is fine unless your driveway is extremely long — in this case, a power sander or floor sander may be a better choice. Use 100-grit sandpaper, and go over the driveway lightly. The idea is to take down any high shine and add some texture to the existing paint. This will enable the new paint to adhere to the concrete better.
Primer helps to bond paint to whatever surface you are applying it to. It also helps to cover up the old paint and any stains that may be on the driveway. Use a primer that is made for outdoor use to help it withstand the UV rays and temperature fluctuations. Additionally, you will want a primer that is made for either concrete or masonry. This will enable the primer to bond itself to the concrete. The paint can then bond itself to the primer.
The paint is the final coat and it needs to accomplish two things: it needs to provide an attractive surface for the concrete driveway, and it needs to help protect the concrete. Select a paint that is made for outdoor use. It should contain sealers to help maintain the surface of the driveway and protect it from rain and sun. Make sure that the paint can also be used on floors if not driveways; the paint needs to stand up to the heavy traffic that driveways are subjected to. Apply two coats for the best coverage, allowing for a thorough drying in between.