MASTERSEAL® 321B 

Silane/Siloxane Based Single Coat Clear Water Repellent for Protecting Vertical Masonry Wall Surfaces 

MASTERSEAL^® 321B is a single component, clear, penetrating water repellent which provides weatherproof protection for vertical surfaces such as clay, brick, sandstone or mineral render. MASTERSEAL^® 321B has a coverage rate - 1-4m2/litre/coat

Features and Benefits

• No significant reduction in moisture vapour permeability
• Long-lasting protection against wind-driven rain
• Improves the aesthetics of the façade by reducing efflorescence
• Surface remains unchanged from the designed appearance
• Water-based; reduces volatile organic emissions into the atmosphere in comparison with today’s commonly used organic-solvent-based repellents
• Provides a much safer working environment for the applicator by minimising health hazards associated with volatile organic solvents
• Non flammable
• Ready for use; no dilution on site means consistent quality
• Overspray and equipment easily cleaned with soapy water
• Virtually no product evaporates during spray application, therefore more active repellent can reach its intended target at equal coverage rates
• Single application only
• Solvent free