You can't use what we call solvents to thin any type of acrylic based paints as they (the paints) are water based. Windex is classified as a water based chemical and will mix with acrylic paints, windshield washer fluid also works and is very cheap, rubbing alcohol also works.
Originally Posted by AllenB
Solvents are used for enamel and lacquer based paints but each must use the proper type of thinner.
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