To use the PlatSil® Part H Hardener, simply add it to your PlatSil® Gel as directed. It will increase the gel's Shore hardness and give you more time to work with it and remove the mold. When handling this product, make sure to read the Safety Data Sheet to avoid any potential risks. Keep it in a cool and dry place to maintain its quality. Regularly check the product's condition to ensure it's still suitable for use.