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You can paint over old paint on a concrete porch. For the best results, you should first clean the surface and remove as much paint as you can. A power washer is helpful here, but you’ll also want to scrape as much of the old paint away as possible. Then you should prime the porch before repainting it.

Yes, you can seal old concrete, but proper preparation is essential. Before sealing, ensure the concrete is clean, dry, and free of any old sealant. To check if resealing is necessary, place a few drops of water on the surface; if they are absorbed in less than five minutes, it's time to reseal. If you are using the same type of sealer that was previously applied, you may not need to remove the old layer. However, if you are applying a different type of sealer, the existing one must be removed. Additionally, repair or fill any cracks to create a smooth base before you begin sealing.

The best way to resurface a concrete porch is to clean and prep the surface, pour a layer of concrete on top, allow it to cure, then seal it. A concrete overlay provides a durable layer and enhances your porch's look. You can even choose a stamped overlay to make it look like stone or brick. To ensure structural integrity, repair concrete cracks before applying the new concrete. If the existing concrete is in significant disrepair, consider removing and replacing the concrete instead of an overlay.

If your concrete stains are green in color, it indicates the presence of mold or algae—which you should address right away. If left unattended, mold will spread to other areas throughout the home. However, be careful not to disturb mold on indoor concrete surfaces and work with a local mold remediation specialist for specialized care. Once free from mold and algae, seal your concrete to eliminate pores and gaps.