292 D. Tuazon St. 1115 QC, Philippines
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Boysen® Plexibond™ #7760

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. It offers excellent corrosion resistance when applied on metal surfaces, and can also be used to improve adhesion to mortar patching and tile grouts.

Principal uses: Excellent adhesion to concrete, bricks, wood and good corrosion resistance on metal surfaces such as G.I. sheets.

5-6 square meters / 4-liters

One (1) hour

One (1) hour

Approximately twenty (20) mils

Allow overnight before applying paint

Not necessary

4-liter cans


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 twenty (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.


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 fourteen (14) to twenty-eight (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 kilograms of cement to four (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 thirty (30) minutes, while pot life is two (2) hours.

Vertical Surfaces:
For vertical surfaces such as firewalls, apply two (2) 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 five (5) to six (6) square meters per gallon. Orange peel textured finish can also be achieved by applying on coat by brush and a second by mortar gun. Recoating interval is one (1) to two (2) hours.

Horizontal Surfaces:
For horizontal surfaces such as roof decks, parapets, canopies and ledges, apply five (5) coats by brush or three (3) 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.

Cases of Large Cracks:
For filling large cracks, add three (3) parts by volume of fine uniform-sized sand to one (1) part cement and mix with Boysen® Plexibond™ to trowellable consistency.

1. The effectiveness of Boysen® Plexibond™ as waterproofing is limited to water coming from positive side (water ingress above the coated part of the substrate) and not from the negative side (water coming from the back of the coating applied on the substrate).

2. The cementitious coating will be able to cover hairline cracks but will not bridge gaps and active structural cracks. Immediate repairs using suitable sealants should be done.

For maximum durability, paint application is recommended. Allow Boysen® Plexibond™ to dry at least one (1) day before paint application. Suggested painting systems are:

1. Boysen® Wallguard™ – dirt-resisting water-based acrylic finish
2. Boysen® Acrytex™ – watertight acrylic solvent based finish
3. Boysen® Permacoat™ Latex – acrylic water-based latex finish
4. Boysen® Acqua Epoxy™ – acrylic water-based epoxy finish


For technical reasons connected with color reproduction and paint manufacturing, these patterns may not exactly match the paint color.

B7760 Boysen Plexibond