Using these Polytek silicone color pigments is easy. First, figure out the total mixed weight of your silicone mix. You can add up to 0.5% of this weight in pigments. Before you mix Part A and Part B of your silicone, add the pigments to Part B. Then, give it a good stir. This will ensure the color is evenly distributed. Remember, if you need more information about how to use these pigments with your specific silicone product, check the Technical Bulletin. Also, be aware that if you're using the white silicone color and you live in California, this product contains Titanium Dioxide, which can cause cancer. You can go to www.P65Warnings.ca.gov for more details. As for maintenance, keep the pigments in a cool, dry place to maintain their quality.