40 Pc 1/16" to 3/4" High Temp Silicone Rubber Tapered Plug Kit - Powder Coating Custom Painting Supplies Flexible, durable and reusable. Withstands heat up to 600 degrees Fahrenheit/315 Celsius. Use for powder coating, painting, plating, anodizing, media blasting, etc. Premium quality silicone will not crack, shrink, harden or break. Color coded - easily grab the right size.