Introduction to Brush-On 50

Brush-On 50, a part of Smooth-On’s Brush-On Series, is an extremely versatile mold rubber renowned for its abrasion resistance and high tear strength. With a convenient one-to-one mix ratio, it is easy to mix and apply with a brush or spatula.

Preparing for Application

Before applying Brush-On 50, it is crucial to prepare the surface by sealing porous materials, applying a release agent, and ensuring good ventilation. Wear safety glasses, long sleeves, and rubber gloves to minimize contamination risk.

Application and Curing

Apply Brush-On 50 in layers, allowing each layer to dry before adding the next. The first coat should be applied in a thin layer to capture intricate detail. Let the rubber cure overnight at room temperature (73°F/23°C) before demolding. Post curing can be done by heating the rubber to 150°F (65°C) for 4 to 8 hours to increase physical properties and performance.

Using the Mold

Once the mold is fully cured, a rigid support shell (mother mold) is needed to support the rubber mold during casting. Apply a release agent to the mold before each casting, and use the appropriate release agent depending on the material being cast.

Performance and Storage

Fully cured molds are tough, durable, and will perform well if properly used and stored. Clean the mold with a soap solution and wipe it dry before storing it on a level surface in a cool, dry environment. Avoid stacking molds, exposing them to moisture or UV light.