Brushable silicone rtv mold making rubber kit

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Brushable silicone rtv mold making rubber kit

Mold Max Stroke - 1 Gallon Unit
Brushable tin-cure silicone rubber.
Mold Max Stroke is a brushable tin silicone rubber that self-thickens for making fast brush-on molds of almost any model. Properly applied, it will hold a vertical surface and will reproduce the finest detail. Mixed 100A:10B by weight, rubber quickly develops thixotropy and can be applied with a brush or spatula. Working time is 20 minutes, re-coat time is 45 minutes and cure time after the final layer has been applied is 16 hours at room temperature.
Mold Max Stroke silicone will not stick to most surfaces and will cure with negligible shrinkage to a strong, flexible Shore 30A rubber. 4 thin layers is all that is necessary to make a strong and durable production mold for casting wax, gypsum, concrete or resins (urethane, polyester, etc.). Applications include reproducing sculpture, architectural restoration, candle molds, etc.
PREPARATION... Safety Use in a properly ventilated area ( room size ventilation). Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Wear vinyl gloves only. Latex gloves will inhibit the cure of the rubber.
Applying a Sealer / Release Agent -
Although not usually necessary, a release agent will make demolding easier when brushing into or over most surfaces. Ease Release is a proven release agent for making molds with silicone rubber and for releasing new silicone from cured silicone.
Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.
MEASURING, MIXING & APPLYING RUBBER...
You will need two containers: The first will be used for measuring out Part A and Part B. The second should be large enough to contain amounts of both components and allow thorough mixing. Part A is Mold Max 30 Part A. Before you begin, shake or pre-mix Part B thoroughly. After dispensing required amounts of Parts A and B into mixing container by weight (you must use an accurate gram scale), mix thoroughly for 3 minutes making sure that you scrape the sides and bottom of the mixing container several times.
Applying The Rubber This product must be applied in layers. Mold makers generally find that four thin layers (minimum 3/8 thickness) is suitable for a strong, working mold. Using a stiff brush, the first coat of rubber should be applied in a very thin layer to capture intricate detail. Use dabbing strokes, especially around undercuts, to reduce entrapped air.
Subsequent coats will add strength to the mold. Let the first coat dry for 45 minutes at room temperature until it becomes tacky before adding the next coat. Tacky is defined as sticky to the touch, but does not come off onto your gloved finger. Once tacky, you are ready to apply the next layer. Keep applying layers until desired mold thickness is achieved. Note: Although not necessary, adding a small amount silicone pigment to every other mix of rubber will help you distinguish one layer from the next. It ensures that you apply a thorough coating each time and help build uniform layers.
Option: Add Silicone Thinner to your initial mix to lower the viscosity of your print coat . It is not recommended to exceed 10% by weight of total system (A+B).
Apply A Support Shell Once the mold is fully cured, a rigid support shell (mother mold) is necessary to support the rubber mold during casting.
CURING, CASTING & USING THE MOLD...
Curing Allow the mold to cure at least 16 hours at room temperature (73 F/23 C). Do not cure rubber where temperature is less than 65 F/18 C.
Casting You can cast low temperature melt metal alloys, gypsum, wax, concrete, liquid plastics, epoxies etc. This product will inhibit the cure of platinum cure silicone rubbers.
Using The Mold Although not necessary, applying a release agent before casting most materials facilitates demolding and will lengthen the production life of your mold. The type of release agent to use depends on the material being cast. Ease Release is recommended for casting resins. In & Out II works well for releasing concrete. Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.
Mold Performance & Storage Fully cured molds are tough, durable and will perform if properly used and stored. The physical life of the mold depends on how you use it (materials cast, frequency, etc.). Casting abrasive materials such as concrete will erode mold detail, while casting non-abrasive materials (wax) will not affect mold detail. Using the right release agent is essential in all cases. Before storing, the mold should be cleaned with a soap solution and wiped fully dry. Two part (or more) molds should be assembled. Storing the mold with a casting in it will maintain dimensional stability. Molds should be stored on a level surface in a cool, dry environment.