Caution: paints and wood stains sold in the European Union before 01 March 2022, may contain Methylethyl Ketone Oxime – MEKO, which has been classified as a Carcinogen of Category 1B.
Most enamel paints are oil- or turpentine-based alkyd resin paints, which may be diluted with organic solvents, like alcohols, aliphatics, aromatics, ketones, white spirit etc., and various combinations thereof. Apart from their toxicity, there are a number of properties which make solvent-based paints unsuitable for painting soft plastic miniatures.
Hard and Brittle
Less flexible than water-based paint, solvent-based enamel paint dries to a hard surfaced finish, which becomes more brittle with age; it cracks and chips off if the painted surface is bent, or if it contracts and expands due to temperature changes. S. Paint Chipping off Miniatures?.
Exposed to ultraviolet light, solvent-based enamel paint becomes chalky and fades more quickly than water-based paint.
In the absence of ultraviolet light, solvent-based enamel paint is prone to yellowing.
Brittling of Plastic Miniatures
Aromatics in solvent-based enamel paints and paint strippers remove plasticizers from plastics, making them brittle. S. Plastic Corrosion of Collectible Miniatures.