The basics Use JH Customs Super Flex Additive to help ensure your paint sticks to synthetic materials and patent leather.  The benefits Will work with angelus paints. Use with other brands at your own risk. The uses In order to create the paint, you need to mix 1 part additive to 8-9 parts paint (or around 1/10 of the mixture).  The bottom line This is the additive that goes into the Super Flex paints sold by JH customs.