8 Best High Pressure Water Leak Sealant for 2025

Sika

• Multiple applications: Whether your in the Automotive, Marine, Engineering, Electrical, Building, Plumbing, Industrial industries or simply a keen DIYer this non adhesive silicone self fusing repair tape is a must have for your tool box
• Specifications: This tape has amazing list of features, it is totally waterproof, insulates up to 8,000 V, withstands high temperatures (-65 to +260 degrees Celsius), can handle pressures up to 700psi and resists petrol, acids, solvents, saltwater and UV rays
• Use anywhere: This tape is so diverse that it can be used for permeant or temporary repairs to just about anything including U-bends, Pipes, Hoses, Electrical insulation, binding rope ends, corrosion protection, strapping, tool grips and much more
• Results: Once fitted the tape provides and air and water tight seal without the need for additional sealants and it can even works under water
• Colour and Length: Available in 3 m roll and black in colour only

Fernox

• Jointing compound and external leak
• Ideal for use on compression joints and screwed fittings
• WRAS Approved- Completely safe to use with drinking water
• Never sets rock hard; joints can easily be undone
• Ready to use, no mixing

Rocol

• Rocol Gasseal is an off-white, non-setting sealant for use on metallic threaded joints including alu
• Joints can be assembled and pressure tested immediately
• Compatible with foam forming leak testers
• Resists vibration
• Suitable for use with natural gas and LPG pipework
• Non corrosive to aluminium, brass, copper, low carbon steel and zinc

Evo-Stik

• Instant repairs for pipes, radiators, tanks and cylinders, sets in minutes
• Can be applied to wet surfaces and even underwater
• No need to drain the system
• When dried it can be drilled, sanded, machined and painted
• Bonds to copper, steel, aluminium, fibre glass, acrylic and porcelain

Technicoll

• HIGH QUALITY BLACK SEALANT 300ºC HEAT RESISTANT
• Creates 100% rubber which leaves flexible at temperatures - 60ºC up to up to + 300ºC
• Perfectly bonds to all smooth metal surfaces, alloys and casts glass, ceramics, plastic, wood,
• mineral products, marble, stone,concrete etc. Replaces different kind of gaskets resistant to
• UV radiation, changing weather conditions, oils, cooling liquids, petrol, and water.