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Warm the bottle - use a solvent that is acrylic compatible and mix like heck. Water based solvent probably will not work unless there is a pigment "goo" in the bottom of the bottle. If still not working try decanting off the liquid and attacking the hardened pigment with solvent. I use variations of this approach on enamels with success. Previous Message
I mostly use Polly Scale but I do have some aged flat Testors acrylics. I recognize the fact that everybody’s pigments settle into gunk at bottom of bottle, my point being I am trying to rescue these aged Testors acrylics.
Testors offered two types of acrylic thinner. Testors Universal Thinner which they offered after their purchase of Floquil/Polly Scale. I believe this to be merely distilled water. The other Testors acrylic thinner offered far earlier has a distinct chemical odor and came in a 2 oz bottle.
Which of the two thinners should I use to restore these old Testors acrylic paints? I am a brush painter used to the smooth flow of Polly Scale with no brush streaks. I would like to attain the same consistency but have even coverage. My experience with Testors acrylics when first introduced was not a positive one and I abandoned these acrylics for years. I suspect the chemical odor Testor acrylic thinner was made for the airbrush but not the brush painter.
I also have Testors Acrylic air brush cleaner and can state it certainly cleaned my brushes of Polly Scale acrylic paint in a quick hurry.
Any help will be greatly appreciated
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