Fosroc Brushbond - 2 Component Cementitious Acrylic Polymer modified Waterproof Coating 7.05Kg

Fosroc Brushbond is a 2 component Acrylic Polymer modified cementitious coating which consists of Brushbond Powder and Brushbond liquid acrylic emulsion. It requires only the addition of clean water at site to produce an easily brushable coating.

Brushbond is a high performance elastomeric cementitious coating used for waterproofing and to protect atmospherically exposed reinforced concrete structures from attack by acid gases, chloride ions, oxygen & water. 

The product can be used on concrete, brick and blockwork substrates and is equally suitable for new and existing structures. The product is designed to reface and even out variations in concrete and masonry surfaces and bridge shrinkage cracks. It provides a seamless, flexible waterproof coating suitable for water tanks, reservoirs, drainage culverts basements, roofs, toilets & wet areas. The product provides a tough durable water-resistant coating which can withstand light pedestrian traffic and also has excellent weather resistance for exterior applications.

Areas of Application

• Water tanks
• Reservoirs
• Drainage culverts
• Basements
• Roofs
• Toilets & wet areas. 

Features

• Excellent barrier to carbon dioxide, chloride and sulphate ions.
• Allows water vapour to escape from the structure.
• Waterproof-suitable for water retaining structures.
• High resistance to the effect of long-term weathering, durable in all climate conditions including UV attack.
• Flexible, with thermal expansion similar to concrete.
• Excellent bond to concrete and masonry.
• Good crack accommodation capacity.
• Minimum surface preparation needed and low labour costs.

Technical Specifications

Mixing Ratios

Application Instructions

Surface Preparation

All surfaces which are to receive the coating must be free from oil, laitance, grease, wax, dirt or any other form of foreign matter which might affect adhesion. Typically, concrete surfaces can be cleaned using high pressure water jet or grit blasting or by proper wire brushing Spalled surfaces or those containing large blow holes, cracks and other such defects should be repaired using Renderoc concrete repair mortars. For further advice on suitable repair mortars, contact the local Fosroc Office.

Mixing

Brushbond liquid is poured into a plastic or metal drum. To this, an equal volume of clean fresh water is added, for brush application consistency. Then mixing is started with a slow speed drill (350-450 rpm). The powder component is added gradually to the liquid avoiding lump formation and mixed for 2-4 minutes. Mix and use. More material should not be mixed than can be used within pot life. Retempering with water should not be done. Keep on stirring during application.

Application

For best results moisten the surface before coating with Brushbond. Apply the mixed material using a short, stiff bristle brush preferably 100 to 150mm width like a paint. Trowel applications can be undertaken as necessary using the correct mixing ratio to obtain satisfactory consistency. Brushbond shall be applied in two coats to achieve 1mm thickness. The second coat of Brushbond shall applied as soon as the first coat has reached touch dry state. On hot substrates, i.e., over 40C surface temperature, a primer coat of mixed Brushbond Powder and water with a slurry like consistency should be applied. Prime only areas that can be coated with Brushbond Powder before the primer dries. Material should not be applied at temperatures below 100C. It is recommended that for general re-surfacing the total thickness of the applied material be 1 to 2 mm. Areas subjected to moderate and heavy loads/hydrostatic pressure, minimum 2mm thickness coating is recommended with screed above. Allow the Brushbond to dry before covering with screed. Sprinkle coarse sand on wet surface of final coat for better adhesion of screed. Average drying time is 4 to 6 hours at normal temperatures

Mechanical Key (Vertical & Horizontal application)

Sprinkle sieved coarse sand on wet surface of final coating for better adhesion of plaster or screed. Allow the coating to dry for a minimum period of 7 days before covering with plaster on the vertical surface & 3 days before covering with screed plaster on the horizontal surface. Maximum thickness of cement plaster recommended is 12 to18mm & height of 1mt in a single day to avoid de-bonding of plaster from Brushbond coating.

Any deviation from the above recommendation please contact Local Fosroc office for advice.

Coverage

This depends on the required consistency. The approximate coverage per pack at even consistency (1mm wet film thickness) is as follows:

Consistency Brush application

Coverage (6kg+1.05kg pack) 4 - 4.5 sqm (40 to 45 sqft)