The Best Head Gasket Sealant of 2023

Permanently Seals Blown Head Gaskets

Permanently Seals Leaking Radiators

Permanently Seals Warped & Cracked Heads

Permanently Seals Leaking Heater Cores

Includes 32oz Head Gasket sealer and 32 oz Flush

Stops block leaks

Seals cracked cylinder heads and blocks

Repairs blown head gaskets

Dual Action 2 Part Formula — LIQUID CERAMIC: Liquid penetrates large and small leaks to form a seal actually harder than the original head gasket — REINFORCED FIBERS: Fiber additives lock together with liquid to increase strength and promote a permanent seal

Head Gasket Sealant is NOT COMPATIBLE with antifreeze and must only be added to the cooling system after ALL ANTIFREEZE has been flushed and removed.

Included components: Unit, Instruction Guide

Repairs blown head and intake gasket leaks

Seals cracked cylinder heads and blocks

Stops heater core and radiator leaks

Fixes leaking freeze and core plugs

Fast-drying, metallic copper sealant that helps dissipate heat

Prevents gasket burnout and improves heat transfer

Seals instantly

Resists all types of automotive fluids, especially gasoline

Typical applications include cylinder head gaskets, carburetor gaskets, exhaust manifold gaskets and other high temperature applications

Good for Head Gaskets, Warped or Cracked Heads, Heater Cores, and Freeze Plugs

Contains no solid or particulate matter that can harm a vehicles engine

Alternative solution for costly and time consuming repairs

Safe and easy to use

Permanent Repair

Do-It-Yourself Formula

Easy to Use Pour-n-go

Used for 4 cylinder and v-6 engines

Permanently Seals Blown, Cracked or Leaking Head Gaskets

Hard setting, economical sealant

Formulated to lubricate under the most adverse brake conditions

Seals all common gasketing materials

Resists diesel fuels and most auto shop fluids

Designed for temperature range -65 F to 350 F

Flash Point: 24.44

Just Pour & Go – No Need for Expensive Head Gasket Repairs - The Safe and Easy Way to Fix a Coolant Leak

Fixes blown head gaskets, cracked heads and blocks

A permanent repair, guaranteed for the lifetime of the engine

Scientifically Tested - K-Seal is the only product to have been successfully tested by the equipment at Brighton University and classes as meeting the demands of ASTM D3147

If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully

Easy Pour and Go Formula!

Permanently fixes head gaskets, engine blocks, cooling systems, and cylinder heads.

"Contains 3 unique technologies. Military-Strength Fibers create multi-layer repair over cracks with a web-like weave. Nanotechnology permanently fixes the smallest cracks and crevices. Cool-X Conditioner – lowers operating temperature as it circulates through cooling system."

Seals larger holes with less fluid loss than competitive products as proven by lab test (ASTM D6107)

Works with all antifreeze or plain water.

Stops block leaks

Seals cracked cylinder heads and blocks

Repairs blown head gaskets

Contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate gaps & cracks and harden to permanently stop leaks.