A water based solvent system comprising water, propellant and possible organic co-solvent, for tinting an aerosol paint in an aerosol can with a filling device having a cup having functionally connected thereto mechanized color paste dispensing elements which enable dispensing into the filling device's cup the liquid containing a color paste mixture in an amount A, which solvent system contains - a liquid present in the cup of an aerosol can filling device, which liquid occupies a volume V1 of a filling volume V2 of the cup, comprises with respect to its volume V1: a color paste mixture 10-100 % by volume having a predetermined color tone, water 0-90 % by volume and a binder 0-90 % by volume, which color paste mixture being made up of several color paste components, each of which have at least the volume Amin, by dispensing into the cup, with mechanized dispensing elements, each of said individual color paste components in a ratio defined by the recipe of the color paste mixture tone, whereby - a base paint to be tinted comprising an emulsified binder and a propellant said base paint being, dispersed into a water compatible solvent, present in the aerosol can, with a filling volume V and occupies, as a liquid under pressure a total volume of Vt of said filling volume V, characterized in that - the base paint to be tinted comprises with respect to total weight: binder and separate dispersing agent/emulsifier or an emulsified binder 15-80% w/w preferable 20-75% (w/w) by weight and propellant 18-45% (w/w) by weight, preferably 25-35% (w/w) by weight wherein the binder is an acrylic dispersion or an acrylic emulsion, and propellant is dimethyl ether or a mixture of dimethyl ether along with butane, propane, CO 2 or HFC-134a and said recipe of the color paste mixture tone is selected from the group of different recipes in which group each recipe defines the exact amount of each individual color paste compound to make up the color paste mixture having a predetermined color tone so that: the total volume and the total amount A tot of the color paste mixture have been adapted to depend on the aggregate volume and the amount of the binders in the aerosol can and in the filling cup; and the minimum volume Amin of each color paste component dispensed into a filling cup is 0.1-0.2 ml which minimum volume Amin is adapted to be same as the minimum paste volume requirement for base paint to be toned in an accurate way wherein said accurate toning means that the maximum color deviation dE is 1.0 preferable 0.7 from the intended color tone of the toned base paint. - a liquid present in the cup of an aerosol can filling device, which liquid occupies a volume V1 of a filling volume V2 of the cup, comprises with respect to its volume V1: a color paste mixture 10-100 % by volume having a predetermined color tone, water 0-90 % by volume and a binder 0-90 % by volume, which color paste mixture being made up of several color paste components, each of which have at least the volume Amin, by dispensing into the cup, with mechanized dispensing elements, each of said individual color paste components in a ratio defined by the recipe of the color paste mixture tone, whereby - a base paint to be tinted comprising an emulsified binder and a propellant said base paint being, dispersed into a water compatible solvent, present in the aerosol can, with a filling volume V and occupies, as a liquid under pressure a total volume of Vt of said filling volume V, characterized in that - the base paint to be tinted comprises with respect to total weight: binder and separate dispersing agent/emulsifier or an emulsified binder 15-80% w/w preferable 20-75% (w/w) by weight and propellant 18-45% (w/w) by weight, preferably 25-35% (w/w) by weight wherein the binder is an acrylic dispersion or an acrylic emulsion, and propellant is dimethyl ether or a mixture of dimethyl ether along with butane, propane, CO 2 or HFC-134a and said recipe of the color paste mixture tone is selected from the group of different recipes in which group each recipe defines the exact amount of each individual color paste compound to make up the color paste mixture having a predetermined color tone so that: the total volume and the total amount A tot of the color paste mixture have been adapted to depend on the aggregate volume and the amount of the binders in the aerosol can and in the filling cup; and the minimum volume Amin of each color paste component dispensed into a filling cup is 0.1-0.2 ml which minimum volume Amin is adapted to be same as the minimum paste volume requirement for base paint to be toned in an accurate way wherein said accurate toning means that the maximum color deviation dE is 1.0 preferable 0.7 from the intended color tone of the toned base paint. the total volume and the total amount A tot of the color paste mixture have been adapted to depend on the aggregate volume and the amount of the binders in the aerosol can and in the filling cup; and the minimum volume Amin of each color paste component dispensed into a filling cup is 0.1-0.2 ml which minimum volume Amin is adapted to be same as the minimum paste volume requirement for base paint to be toned in an accurate way wherein said accurate toning means that the maximum color deviation dE is 1.0 preferable 0.7 from the intended color tone of the toned base paint.