This depends on which coatings type you order. There are both 1:1 and 2:1 part products generally available with SL&C. There also additional ratios between one to one and five to one as well as variable ratios to create different hardness versus flexibility. Each product is different, and customizable for your specific application. Instructions are provided with all our DIY kits based on your specific application. Always call our support number for additional information if in doubt.