What is the difference between poster and acrylics?

Question

can i use poster instead of acrilics and one more thing.....

can i use little water with poster or acrylics

Answer 1

I will add that poster paints are generally much thinner in consistency than acrylics. You can palette acrylics and make heavier strokes. Also, acrylics are water soluble and since poster paints are generally thin in viscosity to begin with, you have much more variation with acrylics.  

Answer 2

Generally speaking, you can use poster instead of acrylics.

Much depends on which support you are painting on.

If you are using paper, no problem.

On board, wood and canvas, it could be a problem.

You can use little water with both.

POster paints are made by grinding pigments with simple water-soluble binders, such as glue, casein, or dextrin, and they ordinarily contain considerable amounts of inert pigment or extender for they are essentially cheap products. A preservative, an odorant, and, in some of the better grades, a little glycerin round out the recipes.

The distinctions implied in the names given to them by various makers are unstandardized and not indicative of quality.

Poster colors, show-card colors, opaque watercolors, and tempera colors are some of the names by which these products are sold.

On the other hand, artists' colors utilizing an acrylic polymer emulsion as a binder have been on the market since the early 1950s. They are safe and reliable, if a little more pricey than  poster colours.