Yes, you absolutely can and should use a sealant on your concrete outdoor furniture to significantly improve its stain resistance. Concrete is a porous material, making it susceptible to absorbing spills from food, drinks, and oils, which can lead to permanent stains. Applying a high-quality sealant creates a protective barrier that repels liquids, giving you time to wipe up spills before they soak in.
For best results, choose a sealant designed for exterior concrete, such as a penetrating silane/siloxane sealer or a film-forming acrylic. Penetrating sealers soak into the pores without changing the look, while acrylics can offer a slight sheen. Ensure the furniture is thoroughly clean and completely dry before application. Apply the sealant evenly with a brush or roller, following the manufacturer's instructions, and allow it to cure fully. Reapplication every one to two years is typically recommended to maintain optimal protection. This simple process will preserve your furniture's appearance and make maintenance much easier.