VFI recommends a specific double-mix method for mixing our urethane molding rubber. First, you will determine how much material you need and measure that out using the mix ratio by volume or weight. Once you have the A side in one container and the B side in another, thoroughly premix the B side and then combine it with the A side. Mix them until uniform using power mixing or meter mixing equipment. Be sure to scrape the bottom and sides of the container for uniformity. Transfer the material to a new, clean mixing container and mix again. This will ensure a thorough mix before it is poured into the mold box.