sentences:  The raw materials are shipped in two separate containers (known in the industry as a kit) identified as "A" and B" compounds, with the "B" side usually containing the catalyst, but may vary based on the brand of silicone used.The two (A and B) compounds must be mixed in a 1 to 1 ratio, usually by way of a static mixer, adding pigment during the mixing process before the curing process begins.Once the two components come together the curing process begins immediately.