How To Use Zinsser Watertite

Stop the Damp: Why Zinsser Watertite is the Ultimate Solution for Wet Masonry

Dealing with damp patches, peeling paint, or that lingering "basement smell" can be a nightmare for any property owner. These issues are especially common in cellars, foundations, and below-ground walls where moisture is constantly fighting to get in.

If you need to stop water in its tracks, Zinsser Watertite is widely considered the gold standard in waterproofing technology. Here is everything you need to know about why this high-performance paint is a must-have for your next project.

What makes Watertite different?

Unlike standard masonry paint that simply sits on the surface, Zinsser Watertite is a professional-grade waterproofing paint specifically formulated for both interior and exterior masonry. Its unique power lies in its ability to resist hydrostatic pressure—the force of water pushing through a wall from the outside.

The Key Benefits of Using Zinsser Watertite

• Total Water Intrusion Prevention: It creates an impermeable barrier that stops water from seeping through porous masonry, keeping your space bone-dry even under pressure.
• Stops Damp Patches & Blistering: By preventing moisture from migrating through the wall, it eliminates the unsightly damp patches and "bubbling" paint common in older buildings.
• Mould & Odour Control: Moisture is the primary cause of mould growth and those distinctive "musty" smells. Watertite contains a powerful biocide that protects the dried film against fungal growth for up to five years.
• Versatile Application: Whether you are sealing a basement, a retaining wall, or a foundation, Watertite can be applied to wet or dry surfaces, making it incredibly reliable for urgent repairs.

Where should you use it?

Because it is designed to withstand the toughest conditions, it is the ideal choice for:

• Basements and Cellars: Transform damp storage areas into usable, dry spaces.
• Retaining Walls: Protect structural walls from ground-water saturation.
• Foundations: Ensure the "roots" of your building stay protected from the elements.

A Step-By-Step Guide: How to Apply Zinsser Watertite Like a Pro

Achieving a 100% waterproof seal depends on how well the paint bonds to the masonry. Follow these essential steps to ensure your application stands the test of time.

Step 1: Surface Preparation

Before you open the tin, the surface must be clean and structurally sound.

• Clear the Debris: Remove all dirt, dust, and old, flaky paint. If you see efflorescence (those white, powdery salt deposits), use a stiff wire brush to scrub them away. For exterior walls, a pressure washer is highly effective.
• Kill the Mould: If mould or algae are present, you must treat them with a fungicidal wash first. While Watertite prevents future mould, it will not kill existing spores trapped underneath the paint.
• Fix the Cracks: Use a quality masonry filler for standard cracks. If water is actively seeping through a hole while you are working, use hydraulic cement to plug the leak instantly. Remove any loose or crumbly masonry to ensure you are painting onto a solid substrate.

Step 2: The First Coat (The "Anchor" Layer)

This is the most important stage of the process, as this layer provides the primary waterproof seal.

• Stir Well: Stir the paint thoroughly before and during use to ensure the waterproofing resins are evenly distributed.
• Choose Your Tool: While you can use a roller, a brush is highly recommended for the first coat. A brush allows you to "work" the paint into the tiny pits and pores of the masonry.
• Apply Heavily: Apply a thick, even coat. Don’t try to spread it too thin; you want the paint to fill every void in the surface.

Step 3: Drying & The Second Coat

A single coat is not enough for full hydrostatic pressure resistance; a second coat is mandatory for the guarantee to hold.

• Wait for the Cure: Allow the first coat to dry completely. While Watertite is quick-drying, times will vary based on the temperature and humidity of your workspace.
• Cross-Hatch Application: For the second coat, try to apply the paint in the opposite direction to your first coat (e.g., if you brushed vertically first, brush horizontally now). This "cross-hatching" ensures you haven't missed a single pinhole.
• Final Inspection: Once dry, your surface will be fully sealed, protected, and ready for years of service.

Quick Technical Specs for Your Project:

• Coverage: Approximately 2m² per litre. (Ensure you order enough for two full coats!)
• Finish: Smooth, flat off-white (can be overpainted if a specific colour is desired).
• Clean-up: Use soapy water for spills while wet, but check the tin for specific solvent requirements if the paint has begun to cure.

To find out more information or to buy, click the link below:

Zinsser Watertite