Please see link below for your basic steps and more information:
Step 1: Prepare your item to be molded
Step 2: Build your mold box
Step 3: Mix Silicone Rubber
Calculate the volume of silicone needed. 1lb. of Silicone Rubber is approximately 21 cubic inches of volume. The Mini Kit volume of rubber is approximately 5.5 cubic inches. (Cubic Inches = Length x Width x Depth)
BY WEIGHT (With Scale)
10:1 mix ratio. Measure out 10 parts of base to 1 part catalyst by weight.
BY VOLUME (1lb kit)
Using 1oz cups & scoop provided in the kit, measure 1 scoop of catalyst for every 2 ounces of Base.
MINI KIT (Premeasured)
Shake Catalyst bottle and add it to the container of Base. (Must use the entire kit at one time.)