Foster® Multi-Purpose Adhesive 97-15

• Foster® Multi-Purpose Adhesive 97-15 is a synthetic resin emulsion. The dry film remains flexible and resists moisture and humidity. It is non-flammable in the wet state. The adhesive has a smooth, mastic consistency and can be applied to either the insulation or the substrate. It goes on easily and cleanly using a wide variety of application equipment and methods.
• Foster® Multi-Purpose Adhesive 97-15 may also be used to adhere polystyrene and PIR/polyurethane insulation to impermeable surfaces when used as a contact adhesive.

• Store and apply between 40°F (4°C) and 100°F (38°C), protect from freezing until dry.
• Always test plastic foam insulation for warpage when using a water-based adhesive.
• Overhead applications may require mechanical fasteners.
• On rough or uneven surfaces, a thicker application of adhesive may be required in order to assure contact between insulation and substrate. Very rough surfaces should be back-plastered.
• When used as a contact adhesive between impermeable materials, the adhesive must be allowed to dry on both surfaces before mating to avoid entrapment of water.

Material Preparation

• Do not thin. Apply only to clean, dry, oil-free surfaces. Keep container closed when not in use.

Application

• Apply FOSTER® MULTI-PURPOSE ADHESIVE to the selected surface uniformly. While still wet, press the insulation into place making sure that complete contact is made with applied adhesive. When one surface is porous, a wet bond application is suggested for best results.
• When applying between two impermeable surfaces, apply the adhesive to both surfaces or apply to one surface, press insulation in place and then remove the freshly pressed board. Allow sufficient time for the water to evaporate from the adhesive (30 to 120 minutes) on both surfaces. Then reinstall and again firmly press the insulation board into the desired position.

Brush

• Use clean equipment suitable for water-based paints. Do not overwork.

Notched Trowel

• Use a 1/32” to 3/32” notched trowel depending on porosity and smoothness of the surface. Trowel with firm pressure leaving ridges of adhesive. Before the adhesive skins over, press insulation firmly into place to obtain complete contact.
• When using as a contact adhesive, trowel the adhesive onto one surface using a 3/32” notched trowel. Immediately press the insulation and mating surface together to ensure complete transfer of adhesive to both surfaces, ensuring that adhesive ridges are flattened. Remove the insulation from the surface and allow adhesive to flash water (30 to 120 minutes), then press insulation back in place with firm pressure over the entire surface.

Airless Spray

• Adhesive may be applied with conventional airless spray equipment. An inductor plate and ram are suggested to maintain adhesive flow into pump. Apply using a 0.017” to 0.025” tip depending on desired application rate.

Clean Up

• To clean up, use warm, soapy water if still wet. When dry, use mineral spirits (flammable) or chlorinated solvent (non- flammable).

¹ - Subject to type of surface and nature of material to be bonded. Depending on porosity and smoothness of the intended surface.

² - Depending upon temperature, humidity, and application rate

³ - Tested at coverage rate of 200 sq. ft./gal. Applied to 1/4 inch inorganic reinforced cement board. The flame spread may vary at different product thicknesses and/or when applied over other surfaces.

⁴ - Applied at 50 - 100 sq. ft./gal. With cellular plastic insulations (polystyrene foam etc.), use the manufacturer’s maximum service temperature.