Can lake seawalls be painted to prevent moss buildup?

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My wall is about 5 years old, but this year the moss grew into the surface of the concrete block in some places. I know I can kill the moss and prepare the block for painting with pressure washing. What type of primer and sealant should be used to prevent the moss growth?

2 Responses

  1. If you can keep the sea water from reaching the repaired surface for about 2 weeks which is necessary for proper curing of the materials… then I would recommend, after you clean off all the moss, and fill in any cracks with a good grade cement filler and sealer compound (try Home Depot) then I would prime all of the block with masonry primer, one heavy coat… and then finish coat with an Epoxy Paint (use the two part type) and then wait the full two weeks for curing…
    Good Luck…

  2. A recommended primer to prevent moss buildup on lake seawalls is an oil-based or solvent-based primer specifically designed for exterior concrete applications. These types of primers will create a strong bond with the surface and provide a solid foundation for the paint to adhere to. Additionally, consider using a primer that contains mildewcides or mold inhibitors to further prevent moss growth.

    For the sealant, opt for a high-quality acrylic or elastomeric sealant that is moisture and UV resistant. These types of sealants will provide a protective barrier against water infiltration and UV damage, which can contribute to moss growth. Look for sealants that are specifically labeled as “mildew-resistant” or “anti-microbial” for added protection against moss and mold.

    When preparing the surface for painting, ensure proper cleaning and removal of any existing moss or mold. Pressure washing is an effective method for this, but it’s important to allow the surface to fully dry before applying the primer and sealant. Follow the manufacturer’s instructions for application and drying times to achieve the best results.

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