Continuing with Acrylics…
Acrylics can be thinned with water or an acrylic medium, but when dry they are water resistant. Acrylic medium come in gloss or matt finish.
The quick drying quality is both an advantage as well as disadvantage with acrylics.
Hence some precautions have to be taken:
You have to keep all your brushes moist as you are painting. Never let them dry with acrylic paint on the bristles.
Don't leave the tops off tubes of acrylic paint; the contents will go rock hard in no time. If this happens, you have to throw them away. Full stop
If there's any grease on the painting surface, acrylics will not adhere, unlike oil Paints.
Make sure though, the canvas is coated with an acrylic, rather than oil-based primer, or gesso (a product specially made for the acrylic painting technique). Acrylics won't stick to an oil-based primer.
Happy Painting

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vidya