Thursday / Monday
Make sure to watch the How to Make a 2 Part Mold video
Take this short quiz
Select choice top 3 choices of figure to work with.
MOLD MAKING STEPS
BUILD THE MOLD
Simple cardboard mold:
Materials: Cardboard, packing tape, ruler, pencil, scissors/utility knife, double sided carpet tape.
Make a sketch plan. Include measurements. Think upside down. The base of the mold will be the top surface of the object once de-molded. Moldstar is expensive - we want to use minimal amount so measurements are important. Tape all interior surfaces where latex will touch cardboard and exterior corners and base for reinforcement and to prevent leaks.
Mold Star™ mold rubbers are easy to use platinum silicones which are mixed 1A:1B by volume (no weighing scale necessary). Mold Star™ silicones feature relatively low viscosities and vacuum degassing is not required for most applications. Mold Star™ 30 is a harder material, with a 30A Shore hardness. FeaturesMold Star™ silicones cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage. Molds made with Mold Star™ will last a long time in your mold library and are good for casting wax, gypsum, resins, concrete and other materials. Cured Mold Star™ rubber is heat resistant up to 450°F (232°C) and is suitable for casting low-temperature melt metal alloys. Note: Mold Star™ rubbers are not intended for brush-on moldmaking. Note: This product will not cure against surfaces containing sulfur, even when sealed.
MoldStar 30 Watch the one minute video here.
CALCULATE VOLUME OF MOLDSTAR 30 LATEX NEEDED.
Volume of mold
- Volume of positive
= Volume of latex needed
MIX MOLDSTAR 30
SAFETY: Wear safety glasses, long sleeves and rubber gloves.
PREMIX Part A and Part B separately. Containers should be clean. Dispense equal parts of A + B into mixing container (1A:1B by volume), mix thoroughly making sure you scrape the sides and bottom of mixing container several times. Rubber should be a uniform color with no streaks.
POURING: For best results, pour mixture into a single spot at lowest point of containment field. Let rubber seek its own level. A uniform flow will minimize trapped air. Rubber should level off at least ½” over highest point of model (positive).
CURING: MoldstarT20 cures in 30 minutes at room temperature.