Flash Harry White Liquid Plastic WP/Sealer 5L

The Flash Harry Liquid Plastic Waterproofing & Sealer 5L White is a flexible waterproofing solution designed for compatible roofs, walls, parapets, flashings, and other roofing applications. Supplied in a 5-litre container with a clean white finish, it is suitable for waterproofing repairs, preventative maintenance, renovations, and exterior building projects.

Flash Harry Liquid Plastic is a pure acrylic waterproofing polymer modified with latex, providing flexibility, UV stability, and adhesion. The manufacturer specifies approximately 350% stretch, allowing the coating to accommodate movement in suitable waterproofing applications.

Flash Harry Liquid Plastic 5L White

Liquid Plastic is designed to create a flexible water-resistant barrier over properly prepared compatible surfaces.

The white colour provides a clean finish that can complement light-coloured roofing, walls, parapets, and other exterior building surfaces. Flash Harry lists white among the available Liquid Plastic colours, with 5L included among the available pack sizes.

Suitable for Waterproofing Applications

Flash Harry Liquid Plastic is suitable for various roofing and exterior waterproofing applications, including:

• Roofs
• Walls
• Parapet walls
• Flashings
• Roof joints
• Roof ridges
• Valleys
• Skylights
• Chimneys
• Roofing screws
• General waterproofing repairs
• Exterior maintenance

The product can be applied using a brush, roller, or spray, depending on the application.

Flexible Acrylic Waterproofing

The latex-modified acrylic formulation provides approximately 350% stretch, along with UV stability and adhesion. These characteristics make Liquid Plastic suitable for areas where a flexible waterproofing system is required.

For waterproofing applications, Flash Harry specifies that Liquid Plastic should always be used in conjunction with a waterproofing membrane. Proper saturation of the membrane during the first coat is critical to achieving the intended waterproofing performance.

Key Features

• Brand: Flash Harry
• Product: Liquid Plastic
• Size: 5L
• Colour: White
• Pure acrylic waterproofing polymer
• Latex-modified formulation
• Approximately 350% stretch
• Flexible waterproofing protection
• UV stable
• Suitable for roofs and walls
• Suitable for parapets and roofing details
• Brush, roller, or spray application
• Water clean-up while wet
• Suitable for professional and DIY projects

Surface Preparation

Ensure all surfaces are dry, clean, sound, and thoroughly free from dust, dirt, grime, loose coatings, and other contaminants before application.

On porous surfaces, Flash Harry recommends either a suitable bonding liquid or a priming coat made from a 50% dilution of Liquid Plastic with water.

Application Guidelines

For waterproofing applications, apply a generous first coat and immediately embed the appropriate waterproofing membrane while the coating is still wet. The membrane should be fully saturated without bubbles or wrinkles.

Flash Harry recommends a 75mm membrane overlap where sections meet. Further coats should fully cover the membrane weave and complete the waterproofing system.

For coating applications, a minimum of two coats is recommended, applied at right angles to each other.

Important Information

Flash Harry states that Liquid Plastic should not be used to overcoat bitumen waterproofing systems. Compatibility should be checked when applying over unknown existing coatings.

The manufacturer also advises that Liquid Plastic is not recommended for under-tile applications, swimming pools, or fibreglass structures.

Always follow the latest Flash Harry product instructions and technical data sheet for the specific application.

Flash Harry Liquid Plastic product information

Availability

Available in-store and online at Build It DTM.