F9911 EPDM Rubber Sealant is a two-component product, which has a thixotropic consistency to permit application to surfaces of any orientation. The most effective method of application is by trowel on a flat surface and a stiff brush for irregular surfaces.   F9911 EPDM Rubber Sealant can be used for lining steel process tanks, creating a formed-in-place reinforced rubber membrane for concrete tanks and ponds, as well as for creating gaskets for specialized process tanks.

SURFACE PREPARATION

Surface must be clean and dry. Sealant will not adhere to a damp surface, glass or polyethylene and thermoplastic olefins. Smooth metal surfaces must be abraded to create a surface profile for adhesion.

APPLICATION

The pre-measured catalyst supplied must be added to the product prior to application. Catalyzed material can be poured onto surface and distributed with a trowel. Multiple passes are recommended in order to eliminate air entrainment.

A two-coat application is recommended. Each coat should be spread at a rate of 50 sq. ft. per gallon, which will result in a dry film of 20 mils. The solvent vapors are heavier than air, so fans or forced air should be used in enclosed areas to purge the vapors and speed the cure. (Do not use outside air if temperature is below 65°F). Apply a second coat the following day using the same procedure as outlined above. Resulting dry film will be 40 mils.

CREATING A FORMED - IN - PLACE MEMBRANE

Apply first coat of F9911 EPDM Rubber Sealant as described above and allow solvent to flash off for approximately 6 hours. Use ventilation to remove vapors.

Cut polyester reinforcing fabric to desired length and place on tacky rubber surface. Lightly roll fabric with a smooth sponge roller to get even contact with the rubber. Let stand overnight. Note: When coating a tank or an enclosure, apply the rubber and fabric to the walls and several inches of the floor on the first pass. Apply the second coat (at 50 sq. ft. per gallon) no later than the following day, coating over the reinforcing fabric and continuing with what will now be the first coat on the floor. The reinforcing fabric must be put in place in as the coating process progresses to avoid having to walk on the wet rubber. A small area (where ladder rests) will have to be left without fabric and coated from above using a long handled squeegee. Continue to use ventilation.

Apply a second coat to floor 24-36 hours after the first coat. The first coat should be firm enough to walk on by then. A rubber edged squeegee will be easier to use than a trowel for the second coat. A reinforced membrane will be 45 mils when recommended spreading rates are used.

CURE

Allow 4 days of cure at 70°F or higher before putting coating into service. Heat will accelerate the curing process.