Yes, you can water down masonry paint, but specifically for the first coat and only according to the manufacturer's recommendations.
Watering down the first coat is a common practice to help the paint penetrate the surface effectively, creating a good base for subsequent layers. However, the crucial part is following the guidelines provided by the paint manufacturer.
According to best practices and manufacturer recommendations:
- First Coat: You can water down your first coat of masonry paint by the recommended amount, as instructed by the manufacturers data sheet. This ensures proper absorption and adhesion.
- Second Coat (and subsequent coats): Once the first thinned coat is fully dry, you can then apply the second coat of masonry paint. This coat, and any further coats, should typically be applied undiluted, straight from the can.
Key Points to Remember:
- Always check the manufacturer's data sheet: This is the most important step. The data sheet will specify if thinning is needed, the correct dilution ratio (e.g., 10% water), and the recommended drying time between coats.
- Only thin the first coat: Thinning subsequent coats is generally not recommended as it can compromise the paint's opacity, durability, and finish.
Here's a simple breakdown:
| Coat Number | Dilution Status | Notes |
|---|---|---|
| First Coat | Water Down (as per data sheet) | Improves penetration and adhesion |
| Second Coat | Undiluted | Builds opacity and final protective layer |
| Third Coat | Undiluted | Apply if needed for full coverage or finish |
Properly preparing and applying masonry paint, including correct dilution for the first coat, is essential for a long-lasting and effective finish on exterior walls.
