Sealing mastic based on natural resins with high adhesive power. It is used to hold pre-formed gaskets in place before assembly. Suitable for crankcase gaskets, oil sumps and carburettors. Its main characteristic consists in its resistance to temperature and pressure. It is insoluble in hydrocarbons, oils, water, antifreeze mixtures and industrial fluids. It resists vibrations and can be dismantled with normal tools.