The direct answer to painting lead flashings is that you typically do not paint them. Instead, you should treat them with patination oil.
If you've been searching for what type of paint to use on lead flashing, the answer isn't painting at all – it is patination oil.
Why Not Paint Lead Flashings?
Painting lead flashings is generally not recommended and can cause more harm than good in the long run. Lead is a flexible metal that expands and contracts with temperature changes. Paint is rigid and does not move with the lead, leading to:
- Cracking and Peeling: The paint will quickly crack, peel, and blister as the lead expands and contracts, offering no lasting protection.
- Trapped Moisture: Cracks in the paint can trap moisture against the lead surface, potentially leading to corrosion over time.
- Poor Adhesion: Paint does not adhere well to lead's surface without extensive, potentially damaging, preparation.
Using Patination Oil on Lead Flashings
The correct treatment for new lead flashings, and the recommended alternative to paint, is applying patination oil. This oil is specifically designed for lead surfaces.
According to the reference, when applied correctly, the patination oil will protect the lead flashings for years as it safeguards against cracks and drying out.
What Patination Oil Does:
- Prevents Carbonate Staining: New lead can develop a white, powdery residue (patina) that can streak onto surrounding roof tiles or brickwork, causing unsightly stains. Patination oil helps the lead develop its natural protective layer evenly without this staining.
- Provides Protection: It helps prevent the lead from drying out and cracking over time, extending its lifespan.
- Enhances Appearance: It gives the lead a uniform, dark, satin finish initially, which weathers naturally over time.
How to Apply Patination Oil:
Applying patination oil is a straightforward process, best done on a dry day shortly after the lead is installed.
- Ensure the Lead is Clean and Dry: The surface must be free from dirt, dust, and moisture.
- Apply Generously: Use a soft cloth, brush, or roller to apply the oil evenly across the entire surface of the lead flashing. Ensure full coverage.
- Work Quickly and Evenly: Apply in one continuous direction to avoid streaks.
- Do Not Rub In Excessively: A single, thorough application is sufficient.
Using patination oil ensures the lead weathers correctly and remains protected for years without the issues associated with paint.
