BOYSEN® Plexibond™ is a specially formulated acrylic polymer designed for compounding with Pozzolan or Portland cement. The resulting mixture possesses excellent adhesion, water resistance and flexibility even on thin section applications. Its use eliminates any cement plastering defects and water seepage, making it ideal for waterproofing roof decks and firewalls. It makes for a durable and decorative cementitious coating that not only enhances the appearance of light building materials but also prolongs their service life as well with its excellent weatherability.
PRINCIPAL USES: Excellent adhesion to concrete, bricks, wood and good corrosion resistance on metal surfaces such as G.I. sheets.
FEATURES AND BENEFITS:
Outstanding flexibility – A thin section of ordinary cement is hard and brittle and crumbles easily, while cement modified with BOYSEN®Plexibond™ possesses superior flexibility, thus eliminating cement plastering defects. The excellent adhesive and tensile strength balance of BOYSEN® Plexibond™ maintains the integrity of the mortar.
Excellent Water Resistance – When mixed with cement, BOYSEN® Plexibond™ forms a seamless, non-porous impenetrable thick layer that disperses any liquid upon contact, preventing any water seepage when applied on both vertical and horizontal surfaces.
Resistant to Weathering – BOYSEN®Plexibond™ has excellent sunlight exposure resistance, prolonging the service life of light building materials such as marine plywood and cement asbestos boards.
Solvent-free – BOYSEN® Plexibond™ uses water for film cure, and thus has low odor, low flammability or other hazards inherent for solvent based systems.
Retards Fire Spread – BOYSEN® Plexibond™ is non-flammable, and retards flame spread when used as a cementitious coating for light building materials such as plywood.
Excellent Corrosion Resistance – BOYSEN®Plexibond™ offers good corrosion resistance on metal surfaces such as G.I. sheets when applied at a minimum thickness of 20 mils.
Beautifies – BOYSEN® Plexibond™ can be brushed on as a plaster finish or applied by textured roller or mortar gun, giving an attractive “orange peel” textured cementitious coating. The thin cementitious coating allows the preservation of architectural detail on wood, masonry, and metal surfaces.
PRACTICAL COVERAGE: 5 – 6 square meter / 4 liters
SURFACE DRY: One (1) hour
DRY THROUGH: One (1) hour
DRY FILM THICKNESS: Approximately 20 mils
OVERCOATING INTERVAL: Allow overnight before applying paint
THINNING: Not necessary
PACKAGING: 4-liter can
BOYSEN PLEXIBOND should be applied on bare concrete, wood, or metal NOT PREVIOUSLY PAINTED. Existing paint should be totally scraped off. New masonry should be allowed to cure at least 14 to 28 days. Surface should be clean, free from oil, grease, dirt, any loose grit or mortar. Wet masonry surfaces first with water before applying BOYSEN® Plexibond™ mix to avoid abrupt drying and cracking of the applied modified cement, especially under hot and sunny conditions.
Mix 6.5 to 7.5 kgs. of cement to 4 liters of BOYSEN® Plexibond™. Add cement to BOYSEN® Plexibond™ slowly while stirring to prevent lumping. Pass mixture through a fine strainer to sift out lumpy materials. Ensure intimate mixing, stirring as often as possible to avoid settling. Keep mixture proportion constant for a uniform texture. Mix only enough material to prevent waste. Workability of BOYSEN® Plexibond™ mixture is 30 minutes, while potlife is 2 hours.
For vertical surfaces such as firewalls, apply two coats of Plexibond™ mixture by textured roller (for orange peel texture finish) or three coats by brush (for plain finish) while maintaining coverage rate at 5-6 sq. meters per gallon. Recoating interval is 1-2 hours.
For horizontal surfaces such as roof decks, parapets, canopies and ledges, apply five coats by brush or three coats by textured roller.
Reinforce joints, corners and active cracks susceptible to cracking or movement with a strip of fiberglass matting. Put on the matting immediately after the second coat, while the mixture is still wet. The matting should adhere to the mixture. Make sure the Plexibond™ coating and the matting is completely dry before applying succeeding coats. The matting should be completely covered by the mixture. Let dry for one day, then apply a bond coat by brushing BOYSEN® Plexibond™ straight from the can prior to laying out mortar topping.
For filling large cracks, add 3 parts by volume of fine uniform-sized sand to 1 part cement and mix with BOYSEN® Plexibond™ to trowellable consistency.
For maximum durability, topcoat application is recommended. Suggested topcoats are BOYSEN®Permacoat™ Latex, BOYSEN® Acrytex™, BOYSEN® Acqua Epoxy™ or BOYSEN® Epoxy Enamel. Allow BOYSEN® Plexibond™ to dry at least one day before paint application.