Permatex Plastic Tank Repair Kit — Repairs Cracks up to 4", Seals 0.375" Holes, 30-Minute Cure

Permatex Plastic Tank Repair Kit is a complete, ready-to-use system that permanently repairs cracks up to 4" and holes up to 0.375" in plastic tanks in about 30 minutes.

When a plastic reservoir develops a crack or small hole, replacing the entire part can be expensive and time-consuming. The Permatex Plastic Tank Repair Kit gives technicians and DIYers a compact set of professional-grade components plus illustrated instructions so you can restore windshield washer reservoirs, radiator overflow tanks, coolant containers, water holding tanks and similar non-fuel plastic parts quickly and reliably.

How quickly does the repair material set and cure?

The repair resin is formulated to harden within 8–10 minutes for immediate handling and to reach a functional cure in about 30 minutes under recommended conditions. That fast setting time means you can complete a repair during a short project window and return the vehicle or equipment to service the same day.

• Initial harden time: 8–10 minutes
• Functional cure: ~30 minutes
• Best working temperatures: 50°F to 75°F for optimal cure
• Requires surface preparation as shown in the included photographic instructions

What kinds of plastic tanks and damage can it fix?

This kit is intended for repairs to non-fuel plastic reservoirs commonly found on vehicles and equipment. It handles cracks up to 4 inches long and pinhole-to-small holes up to 0.375 inch in diameter, delivering a permanent, structural repair when used as directed.

• Suitable: windshield washer reservoirs, radiator overflow tanks, coolant reservoirs
• Suitable: water tanks and waste tanks (non-fuel applications)
• Not suitable: plastic fuel tanks or components exposed to gasoline
• Includes components and step-by-step photographs to guide repair

What comes in the kit and what tools will I need?

The Permatex kit supplies everything required to complete the repair—including the state-of-the-art repair resin and accessories—so you won’t need specialty materials. Basic hand tools and a clean work area are typically all that’s required to prep surfaces and apply the repair resin following the illustrated steps.

• Kit includes: repair resin and application components
• Instructions: easy-to-follow steps with photographs
• Recommended extras: sandpaper, degreaser, gloves, and a small brush or applicator
• Works best when ambient temperature is between 50°F and 75°F

How durable and permanent is the repair?

When used according to the directions, the resin creates a permanent repair designed to restore strength and stop leaks. The cured material bonds to most plastic tank surfaces and withstands typical service conditions for the applications listed, providing a cost-effective alternative to replacement.

• Designed to form a permanent, structural bond
• Appropriate for pressure-free and overflow reservoirs (non-fuel)
• Resistant to normal fluids used in washer, coolant and waste systems
• Follow instructions and temperature guidelines for best long-term results

Who is this for: The Permatex Plastic Tank Repair Kit is aimed at professional technicians, fleet maintenance crews, and vehicle owners who prefer a fast, reliable repair rather than immediate replacement. It’s especially useful for garages, roadside repair shops, and DIYers who need a compact, all-in-one solution for common plastic reservoir leaks and cracks—so long as the damaged part is not a fuel tank.