Permatex® PLASTIC TANK REPAIR KIT Complete kit contains everything required for making a professional–quality permanent repairs in just minutes. Includes easy–to–follow instructions with photographs. Repairs all types of plastic tanks. The repair resin is designed to harden within 8 — 10 minutes and cures in 30 minutes. Repairs can be made ideally at temperatures from 50°F to 75°F (10°C to 24°C). Repairs cracks up to 4 inches in length and holes up to 3/8 inch in diameter. (THIS PRODUCT IS NOT FOR USE ON PLASTIC FUEL TANKS).