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Bridget Riley uses acrylics and oil paints, gouache and screenprint.
Yes, you can put chalk pastels over acrylic paint. After acrylic paint is dry, you can use soft pastels over the paint so it won't crack.
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Yes, you can paint over XIM with any acrylic or alkyd paint. Read the instructions on the can for drying and recoat times.
Do you realize that you can get FLAT ACRYLIC PAINT. Flat paint refers to the gloss level. You may want Gloss, Satin, Lowsheen or Flat. Acrylic paint on the other hand refers to what the paint is based on or what binder is being used. Acrylic paint is also refered to as waterbased paint. You most likely are referring to putting flat acrylic over lowsheen or gloss acrylic. In answer to your question - as long as they are both acrylic than you will not have any problems. I am in this answer assuming that you are referring you house paints. If not than the same principle applies - acrylic over acrylic is fine. To keep acrylic from going glossy just don't polish it.
You can use oil-based paint pens over acrylic IF the acrylic has not been applied too thickly. You can also use water-based paint pens. HOWEVER, you cannot use acrylic over oil. The difference in how these two mediums dry and cure can make the acrylic-over-oil crack.
No.
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Yes. Acrylic dries impervious to water, and gouache remains water-soluble, so you should be able to dissolve the gouache with water without affecting the acrylic. However, if the gouache was applied before the acrylic was completely dry, there may have been some mixing or staining that is not reversible. Some pigments tend to stain the surface more than others (phthalo blues and greens for example). Test on a small area.
Gouache
No, the solvents in lacquer are to hot and volatile. The lacquer will cause bubbling of the acrylic paint.
He painted on large scale canvasesusing oil, acrylic and gouache paint of objects which are semi abstract :p