Exterior Substrate Prep
Exterior substrate preparation is essential before applying water-repellent coatings on any facade, because the coating's performance depends on the surface quality. Clean surfaces thoroughly, remove moss and efflorescence, and repair cracks or delaminated paint to prevent premature coating failure. Check porosity, moisture content, and test existing coatings for adhesion to ensure primer compatibility.
Concrete, brick, stucco, and plaster each require tailored prep steps and compatible primers to maximize water repellency. Ensure the wall dries completely, allow ventilation, and pre-treat damp areas with breathable primers designed for exterior use. A thoroughly prepared surface improves coating penetration, reduces inconsistencies, and enhances long-term service life.
Water-Repellent Coating
Water-Repellent Coating options include silicone-based formulations, silane/siloxane blends, acrylics, and elastomeric variants, each offering different breathability and water resistance. Choose breathable formulations that permit vapor escape while repelling water, preventing water intrusion and surface staining. Match the coating to substrate type, climate, and sun exposure to ensure durable exterior performance.
Check primer and sealant compatibility around edges, corners, and penetrations where joints are most vulnerable. Review coverage rates, recoat intervals, and whether the product requires a catalyst, moisture cure, or UV cure. Include a simple maintenance plan with periodic inspections and documented service life expectations.
Facade Coating Steps
Begin coating in dry conditions with temperatures ideally between 5 and 30 degrees Celsius and low humidity. Apply using brush, roller, or spray while maintaining a uniform thickness and watching for pinholes. If the product is UV or LED-curable, follow the manufacturer’s curing times and avoid rain during cure.
After cure, inspect for missed spots, poor penetration near joints, and signs of pooling or coating shrinkage. Clean surfaces with mild detergents as needed and plan recoat cycles before performance declines. A disciplined application and maintenance routine preserves exterior waterproofing and reduces the risk of façade leaks.