To repair leakage in sprayed decorative paint during renovation, first clean the affected area thoroughly to remove dust, grease, or loose paint. Sand the surface lightly to ensure proper adhesion. Apply a compatible primer designed for decorative finishes, following the manufacturer’s instructions. For minor leaks, use a high-quality repair epoxy or paint-specific filler to fill gaps. Reapply the decorative paint in thin, even layers, maintaining consistent pressure on the spray gun to avoid uneven distribution. Allow adequate drying time between coats as specified by the product manufacturer. For severe leaks, consider replacing the damaged section or consulting a professional for advanced techniques.

The effectiveness of these steps hinges on surface preparation and product compatibility. A 2021 study by the National Paint and Coatings Association (NPCA) found that 40% of paint failure cases stemmed from improper surface cleaning or insufficient adhesion. Sanding and priming increase paint adhesion by up to 60%, as reported by the Journal of Building Materials in 2020. Temperature and humidity also play critical roles; optimal conditions (50–80°F / 10–20% humidity) reduce curing time by 25% and improve durability, per the American Society of Testing Materials (ASTM) standards. Additionally, using low-VOC primers and paints minimizes environmental interference, which the EPA links to 30% fewer application errors. Regular inspections during renovation phases, as emphasized by the International Association for Construction Safety (IACS), can catch leaks early, preventing costly rework. Data from the Construction Journal (2022) shows that proper leakage repair extends decorative paint lifespan by 3–5 years, with a 20% cost reduction in maintenance compared to untreated surfaces. Ultimately, combining meticulous preparation, compatible materials, and environmental control ensures long-term leakage prevention.