[1] A substance you can add to the liquid in the cooling system to seal leaks. Also called "stop leak."
[2] Other kinds of sealing compounds are used to coat surfaces before installing hoses or gaskets. These are effective in preventing leakage but usually make the hose or gasket hard to remove.
[3] An intercoat between the top coat and the primer or old finish, giving better adhesion.
[4] Any material used to fill cracks and pinholes in a metal surface to be painted, applied before the base coat or as a base coat primer-sealer.

Dictionary of automotive terms. 2015.

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