What are the best coatings to prevent algae growth on concrete bins?

Algae growth on concrete bins is a common problem, leading to slippery surfaces, unsightly stains, and potential structural damage over time. The best coatings to prevent this issue are those that create a dense, waterproof, and often biostatic barrier. Epoxy coatings are highly effective due to their exceptional durability and seamless, non-porous finish that leaves nowhere for algae to take hold. Acrylic elastomeric coatings are another excellent choice; they are flexible, breathable to prevent moisture trapping, and often include mildewcides. For a specialized solution, anti-algae or algae-resistant concrete sealers—which contain biocidal additives—actively inhibit microbial growth. Siloxane-based sealers penetrate deeply to waterproof the concrete from within, making the surface less hospitable to algae. Prior to applying any coating, thorough cleaning (often with a pressure washer and algae-killing solution) is crucial for proper adhesion and long-term effectiveness. The key is selecting a coating designed for exterior concrete that offers both water repellency and algae resistance, ensuring your bins remain cleaner, safer, and more durable for years.