Enduramark has an unlimited shelf life when stored at room temperature out of direct sunlight. If all solvent evaporates, fresh denatured alcohol can be added to resuspend the solid residue and the material can be used as normal. Any chunk that may have formed from solvent evaporation can be broken up with a spoon or other appropriate device. 

Diluted Enduramark shares the same shelf-life properties of undiluted Enduramark. After prolonged storage, it may be necessary to add some additional denatured ethanol.