Not a problem, I have painted a farm yard scene and then painted over with a rocket as my son got older. I used Early Learning Centre paints, cheap and cheerful and done the job!
Generally speaking, poster paint is not durable enough for use in murals, craft paints however are.
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If you are asking will spray paint stick to a bedroom wall the the answer is yes. But, if you are asking about painting an entire wall with spray paint I must advise you not to do that, and here's why.
The fumes and over spray from the acrylic enamel (or any other spray paint in a can) will be absolutely overwhelming and quite dangerous to breathe.
Not to mention the real possibility of accidentally igniting those fumes. Then all of your painting days would be over, forever.
Besides, it would take an astronomical number of cans to cover a wall, even the smallest wall....40 perhaps 50 cans.
It's just not worth it. For $25.00 you can buy a gallon of latex paint and paint your entire room, and even live to tell about it.
It could but it makes all the skin it was applied to burn miserably and may cause dizziness hyperventilation and/or the giving out of your legs and knees.
A muralist or mural artist paints large artwork scenes directly onto walls or ceilings and may use techniques such as fresco. Water based paints, oil based paints, and acrylic paints are commonly used to create large works of art.
Water based paints or acrylic craft paints are the best to use on Styrofoam. Water based paints, specifically poster paints, work well with younger kids as they can get a really good and thick coverage of paint on the polystyrene shape.
There are other wall coverings besides tile. Also, you could use larger floor tile to make the work easier. Maybe an exterior paint would work, but should you want to sell, the buyers would see this as a bad shortcut.
Cement Plastered Walls can be made smooth using Wall putty and Paint consumption will be less when wall putty is used.
"Paints are liquids because a liquid is runny so it helps to paint on paper "Paints are not all liquid, some are solid eg. watercolours etc - they are mostly liquid so they are easier to use, do not solidify easily can be munufactured in large quantities.