Best Radiator Sealant

Polar Clear Leak Fix Spray - 400ml - Waterproof Roof Sealant - Instantly Seals Leaks and Cracks, for Lasting Protection on Roofs, Drainpipes and Gutter Repairs, for Interior and Exterior Use

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal HD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

Holts 1831469 Radweld Plus New Formula 250ml

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

LOCTITE 577, Medium Strength Industrial Adhesive for Thread Sealing, Universal Liquid Adhesive for Pipes and Metal Threads, Chemically Resistant Thread Sealant, 50ml

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g. Suitable for use on a wide range of materials including copper, stainless steel, and plastic.