A few drops of mavala thinner will restore thickened nail polish to its correct consistency making it easier to apply in thin coats two to three fine coats will last longer rather than a thick coat of nail polish that will flake or peel within a couple of days to use if polish is too thick add one or two drops of thinner to the pot and shake well let it stand for 20 minutes before using polish note never try to thin a nail polish with nail polish remover or acetone as these two products