SEALGUARD VFI-993 Silicone Flashing Grade

Equipment

VFI-993 can be applied by brush or trowel to areas not easily accessed or vulnerable areas that need extra protection.

Surface Preparation

Make any necessary repairs to the roof components, including drains, gutters, flashing, penetrations, etc. All surfaces should be clean, dry, and free of contaminants that might inhibit adhesion. A power washer may be needed for hard-to-clean areas. Use VFI-1009 Cleaning Detergent on areas containing oils, animal fats, and grease. Since VFI-993 is recommended for use as part of a roof restoration system, it should be applied after priming with VFI-#11 9:1 Epoxy Primer or a similar primer and before applying a silicone roof coating like SEALGUARD VFI-990 High Solids Silicone or SEALGUARD VFI-991 Silicone.

Mixing

If separation is visible, mixing is recommended using a paddle mixer or drum roller. Mix only until uniform since this is a moisture-cured material and will start reacting with ambient moisture if exposed to the environment.

Application Requirements

Before use, VFI-993 should be brought to a minimum temperature of 65°F and should be applied when the temperature is between 50°F – 120°F. Rain and moisture cannot be present during application for the mastic to cure properly.

VFI-993 can repair most penetrations and protrusions. Use the mastic to fill in stress cracks smaller than ¼”. Add extra material up to an inch around each side of the cracks. Exposed mechanical fasteners must be completely encapsulated with VFI-993, and the fastener base should be sealed to the roof. It should be applied up to ½ an inch thick, but coverage is specific to each job and type of roof substrate. Check specifications for required wet and dry film thickness.

Cleaning

To clean brushes and trowels used during application, VFI recommends using chemically dry mineral spirits. Since VFI-993 is composed of silicone, you should not wash equipment with water as it will cure with moisture.

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

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.