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Flash Harry Grey Liquid Plastic Waterproofing Sealer 5L | Build It DTM

Protect your property against moisture and water penetration with Flash Harry Grey Liquid Plastic Waterproofing Sealer 5L, a practical waterproofing product designed for suitable building maintenance, repairs and waterproofing applications.

Featuring a grey finish and supplied in a convenient 5-litre container, this liquid waterproofing sealer is an excellent option for homeowners, contractors and maintenance professionals looking to protect compatible surfaces against water exposure.

The Flash Harry Liquid Plastic Waterproofing Sealer is intended to form a protective coating when applied according to the manufacturer’s instructions. Whether you’re tackling preventative maintenance or addressing areas vulnerable to moisture, this product can form part of a suitable waterproofing solution.

Key Features and Benefits

• 5-Litre Container: Convenient quantity for suitable waterproofing and maintenance projects.

• Grey Finish: Provides a neutral-coloured waterproofing coating.

• Liquid Plastic Waterproofing Formula: Designed for use as a protective waterproofing sealer.

• Moisture Protection: Intended to help reduce water penetration on approved surfaces.

• Building Maintenance Applications: Suitable for consideration in compatible repair and waterproofing projects.

• Protective Coating: Designed to form a continuous coating when correctly applied.

• Residential and Contractor Use: Practical for homeowners and building maintenance professionals.

• Flash Harry Product Range: Part of the Flash Harry waterproofing product selection.

Flexible Acrylic Waterproofing Protection

Flash Harry Liquid Plastic is a pure acrylic waterproofing polymer modified with latex, providing flexibility, UV stability and adhesion to suitable building surfaces.

The manufacturer describes the product as having up to 350% stretch capability, allowing the cured coating to accommodate movement in compatible surfaces when correctly applied.

This flexibility makes it particularly useful for roof waterproofing and areas exposed to changing weather conditions.

Ideal Waterproofing Applications

The Flash Harry Grey Liquid Plastic Waterproofing Sealer 5L is designed for suitable applications such as:

• Roof waterproofing

• Parapet walls

• Roof flashings

• Corrugated metal roofing

• IBR roofing

• Roof lap joints

• Roofing screw areas

• Suitable wall waterproofing

• General roof maintenance and repairs

For a reinforced waterproofing system, Flash Harry specifies the use of a compatible waterproofing membrane together with Liquid Plastic.

Waterproofing Roofs and Parapet Walls

Roofs and parapet walls are frequently exposed to rain, sunlight and temperature changes.

The Flash Harry Liquid Plastic Grey 5L is designed to help create a flexible protective waterproofing barrier over properly prepared and compatible surfaces.

When combined with suitable reinforcement membrane, it can form part of a continuous waterproofing system around roof details, joints and other vulnerable areas.

Correct surface preparation and application are essential for effective waterproofing performance.

Surface Preparation and Application

Before applying Flash Harry Liquid Plastic, ensure the surface is clean, dry and free from loose paint, dirt, dust and other contaminants.

For reinforced waterproofing, the manufacturer recommends applying an initial saturation coat, embedding the compatible waterproofing membrane into the wet product, and applying additional coats according to the specified system.

On porous surfaces, a suitable priming coat may be required.

Important: Flash Harry advises against applying this product over bitumen waterproofing systems. It is also not recommended for use beneath tiles, in swimming pools or on fibreglass structures.

Always follow the current product technical data sheet for application rates, drying times and curing requirements.

Coverage and Quantity Planning

Coverage depends on the condition and porosity of the surface, as well as the waterproofing system being applied.

For reinforced waterproofing applications, Flash Harry’s published guidance indicates a total consumption of approximately 2–2.5 litres per square metre.

At this application rate, a 5L container would cover approximately 2–2.5m². Actual coverage may vary, so confirm the required quantity before purchasing.

Cleaning and Maintenance

To help maintain waterproofing performance:

• Inspect treated surfaces periodically.

• Keep roof drainage areas clear.

• Remove accumulated debris.

• Check for signs of coating damage.

• Repair affected areas using compatible materials.

• Follow the manufacturer’s maintenance recommendations.

Application tools can be cleaned with water while the product is still wet.

Availability

Get Flash Harry Grey Liquid Plastic Waterproofing Sealer 5L at Build It DTM, your destination for waterproofing products, paints, roofing materials and hardware in Benoni, Gauteng.