VFI®-4110 70 D Trowelable Paste

Thickness Requirements

We recommend applying the material at a minimum of ¼” to create a durable shell over the mold. Increasing the thickness can improve durability. However, it is typically not applied more than ½” thick to prevent sagging. Large molds may require a thicker shell for ensured support.

Surface Preparation

All surfaces should be clean, dry, and free of dirt, dust, and debris. Release agents are required for any molding application to prevent adhesion and extend the life of the mold. We recommend using a silicone-based release or wax over the molding surface before application. This material is compatible with silicone, latex, and other molding rubbers when properly prepared.

If you are making a support shell with two or more pieces, use a separation material around the molded object, like moldable shims or clay.

Mixing

Bring the material to at least 65°F before use. The B side (Poly) must be premixed to disperse any settled material. Avoid introducing extra moisture or air into the mix. The A side (Iso) does not need to be mixed.

Pour 1 part of the A component into 2 parts of the B component by volume, 61.8 parts A component to 100 parts B component by weight. Mix the material with a flat mixing stick by occasionally scraping the sides and bottom of the mixing container. Use power mixing equipment for volumes over one quart in size. The mixture will start as a golden yellow and slowly become off-white once fully mixed. Transfer to a new, clean container and mix again to achieve a thorough, uniform mix. Mixing and application must be completed before the 15-minute pot life ends.

Application Guidelines

The material should be used at room temperature (77°F) with low humidity. Warmer temperatures will decrease the pot life but accelerate the cure time. The material can be applied using a paint stick or paintbrush to cover the surface and smooth the material down. Additional material can be mixed up and applied as needed.

The shell can be removed from the mold after 90 minutes at room temperature. A hammer and chisel may be needed to separate and pry apart multiple shell sections. At this time, both the mold and support shell can be reassembled for casting purposes. Large support shells may need to be fastened together to prevent distortion while casting.

If you plan to machine it, use an approved mask or respirator to avoid breathing in dust particles.

Full physical properties will develop in 24 hours at room temperature. If you want to speed up the cure, the material can be heated in an oven at 100°F for 8 hours. Do not exceed temperatures above 120°F.

Storage/Shelf Life

The shelf life is 12 months from the date of manufacture. Store in a clean, dry environment between 60°F – 90°F. It must be protected from freezing and kept above 40°F in storage and transport. Once open, use it immediately. A nitrogen purge can extend the shelf life of opened containers after use.

Precautions

This product contains isocyanate, which may irritate the skin and is toxic if inhaled as particulate matter. It can be harmful if swallowed and cause eye irritation, allergies, or asthma symptoms. Seek medical attention if exposed or concerned. Avoid prolonged breathing of vapors or repeated skin contact. Wear PPE, including gloves, eye protection, and face protection. Use only with adequate ventilation. It is not UV stable and does not have any long-term UV testing. Do not add foreign material to the product. See the Safety Data Sheet for complete safety information.