Plasti-Paste™
Buy Smooth-On at FormX
Smooth-On is one of the world’s leading manufacturers of 3D modeling materials such as mold-making, casting and special effects materials, as well as industrial casting resins, adhesives and equipment. FormX is the main distributor of Smooth-On products in Europe.
Plasti-Paste™ is a two component fiber resin that is designed for vertical surface application. Part A is a liquid and Part B is a paste. Mix ratio is 1A : 3B by volume (41A:100B by weight). It has no odor and pot life is 8 – 10 minutes depending on mass. Demold time (can be handled) is about 90 minutes depending on mass. Plasti-Paste™ holds a vertical surface without sagging and cures to a strong, durable and lightweight plastic. Suitable as a mother mold / support shell (reinforces shape of rubber mold during casting). Can be pigmented with So-Strong™ color tints available at form X. Add cabosil or other filler as an extender or for special effects.
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Instructions
Preparation – Materials should be stored and used in at room temperature 23° C. This product has a limited shelf life and should be used as soon as possible. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Work in a properly ventilated area. Part B is a thick paste containing oil that may separate during shipment. The paste should be thoroughly pre-mixed before dispensing.
Applying A Release Agent – Plasti-Paste™ will bond to most surfaces. To ensure release when using as a mother mold or support shell, apply a sealer and release agent. Use Sonite™ Wax followed by a coating of Universal™ Mold Release or Ease Release™ 200 release agent. As an alternative, aluminum foil can serve as a barrier between the rubber mold and Plasti-Paste™.
Measuring & Mixing – After pre-mixing Part B paste, dispense into a larger container. Measure 1 Part A liquid to 3 Parts B paste by volume. Add Part A liquid to Part B paste. Mix for 2 to 3 minutes, scraping the sides and bottom of the mixing container several times until there are no color streaks.
Applying – Apply mixed Plasti-Paste™ evenly over the mold surface to a minimum thickness of approximately 1 cm. For structural reinforcement, embed strips of fiberglass fabric or burlap into the first layer, then apply a second layer over the reinforcement.
Curing – Allow material to cure for approximately 90 minutes before handling. Material will be hot immediately following cure – let cool before handling. Full strength is reached in approximately 24 hours.
Heat Resistance – Fully cured Plasti-Paste™ (1.27 cm minimum thickness) will resist temperatures up to 55° C. For improved heat resistance to 70° C, post cure at 65° C for 16 hours.
