Silco Superior High-Gloss Acrylic Ultra High Solid Clear Coat & Standard Hardener Combo – 5 L Clear Coat + 2.5 L Standard Hardener. Mix the clear coat and standard hardener in a 2:1 ratio. Apply a light half coat followed by a full closed coat without flash off for spot repairs, or use two full coats with a 15-minute flash off between coats for optimal results.