BOSTIK POWERMASTIK is a permanently elastic, waterproof compound, which remains unaffected by extreme temperature changes. It has good adhesion to all dust-free, non-bituminous surfaces. It will remain plastic under normal structural and thermal movement of the joint to which it is applied. Can be painted with any non-bituminous paint after skin has formed. Excellent for providing a durable, protective seal against entry of water, dust, fumes, etc.

• 100% waterproof
• Polymer reinforced – increases performance life
• Excellent adhesion to a wide variety of surfaces
• Non hardening / good flexibility
• Solvent free
• Non shrinking
• Very good durability
• Paintable once a skin has formed

Safe 4 Kids Washable Non-Toxic Acid Free

Uses / Applications

• Sealing of asbestos, PVC, galvanized iron and aluminium gutter sections & down pipes
• Sealing overlap joints of roofing sections, air duct joints and seams
• Sealing of windows and door frames
• Sealing of roof bolts
• Placing window sills, frames and other fittings where a waterproof seal is needed
• General pointing and joint sealing
• Exhibits excellent adhesion to a wide variety of surfaces used in the construction industry e.g. fiberboard, metals, plaster, concrete, wood and glass

Other Information

• Must not be used in contact with bituminous surfaces
• Not suitable for floor joints
• Not recommended for medium and high movement joints
• Not suitable for continuous immersion in water
• Not for use where strength from sealant is needed


280ml cartridge, 410ml cellopak