SEALGUARD VFI-991 Silicone

Equipment

The coating can be applied to the surface with airless spray equipment, industrial paint brushes, or nap rollers. When spraying, use equipment equivalent to:

• Graco GH 933 or DutyMax GH 675DI are capable of 1.5-2.5 gpm and a minimum constant pressure of 5,000 psi. We also recommend spraying with Graco Xtreme-Duty ½-inch or ¾ inch hoses with ⅜ inch whip hoses and Graco XTR-7 Airless Spray Guns with minimum .030 sized tips. The Graco 5:1 Monarch Transfer Pump should be used with drums.
• WIWA HERKULES GX, model 333/075, produces a flow rate per cycle of 275 cm3 or 9.3 fl oz, a pressure ratio of 75:1, and max inbound air pressure of 6.5 bar or 94 psi.
• Hennes-Johnson Model 5320 Silicone sprayer with a trigger gun capable of providing 5,000 psi of constant pressure at 3 gpm with ¾ or ½ inch nylon lined hoses and a whip hose.

Surface Preparation

For improved adhesion on the roof surface, use a broom to remove all contaminants, including dirt, debris, leaves, or films. Use VFI-1009 Cleaning Detergent to scrub areas containing grease, oil, animal fats, etc. Power wash as needed. Rinse off all cleaning agents and allow the roof to dry.

Make any necessary repairs to the roof components. Tighten gaps and seams to be flush with the surface. Loose or backed-out fasteners should be tight or replaced with oversized fasteners. VFI recommends applying VFI-#11 9:1 Epoxy Primer or VFI-607 Bleed Block Primer to the entire surface for ensured adhesion and SEALGUARD VFI-993 Silicone Flashing Grade over seams, penetrations, and protrusions.

Mixing

Mix the coating until uniform before use. Mix times may vary depending on volume and mixing method.

Application Requirements

VFI-991 should only be applied when the surface and ambient temperatures are between 40°F – 120°F and when rain or moisture are not present during the application and curing process. Bring the material to a minimum temperature of 65°F before use. Apply the roof coating at a minimum of 2 gallons per square. Check specifications for required wet and dry film thickness. For additional reinforcement, apply the coating with polyester fabric reinforcement. The first coat must be fully cured before a second coat is applied.

Cleaning

VFI-991 cures with moisture, so do not use water to clean tools and equipment. We recommend using chemically dry mineral spirits to clean brushes, rollers, and spray equipment. If you are spraying, don’t leave VFI-991 inside the spray equipment. Flush the mineral spirits through the hoses and lines until the uncured coating is removed.

Storage/Shelf Life

The material shelf life is 12 months from the date of manufacture. Store in a dry, temperature-controlled space in sealed and unopened containers between 60°F – 90°F. Opened containers can be resealed with a nitrogen purge, but it will ultimately shorten the shelf life of the product.

Precautions

Foot traffic is not recommended on any roof surface coated with VFI-991. If foot traffic is necessary, wait 24-72 hours for the coating to fully cure before allowing people to walk on designated traffic areas only. Avoid breathing in vapors or repeated skin contact. Do not thin or add foreign material to the product. See Safety Data Sheet for complete safety data.