for effectively sealing holes or cracks in any type of device wherein the larger size holes and cracks are initially at least partially sealed by solid particles which are in a liquid carrier some means is then utilized to cause the liquid carrier to solidify in this manner the solidification takes place after the liquid carrier has penetrated the smaller holes or cracks and has completely filled the larger holes or cracks which had been plugged by the solid particles the solid particles function as bonding agents to which the liquid becomes attached while solidifying the solidification of the carrier can take place in any suitable manner for example a reactant or catalyst can be added to the liquid carrier immediately after time of insertion and thereby utilize a chemical reaction to cause solidification in the preferred form of this invention however the solidification takes place as a result of heat being applied to the liquid carrier by utilizing heat to cause solidification the invention is particularly useful for sealing cracks or holes in combustible engine or its cooling system for example the invention may be utilized for sealing cracked or warped heads or blown head gaskets in an engine or for sealing heating cores freeze plugs radiators or in the cooling system the engine or cooling system may be of a gasoline or diesel type in cars trucks or boats in a preferred embodiment of this invention a liquid part of sealant is obtained by mixing ten.