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http://www.ehow.com/how_2285887_remove-acrylic-paint.html
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This is not easy at all but metal scarper and scrap it of you will have to paint again!
you take liquid glue shaving cream and food coloring and mix them together to make any kind of puffy paints colors
If the white paint is well-bonded to the surface, and the red is very fresh, a lot of times you can use a sharp razor blade to peel the red paint off the white. If the red is stuck on there, I would use a sanding block to remove as much red paint as I could without damaging much of the white paint, then put a coat of white paint over the area. Next time, get a newspaper and tape it to the white walls to protect the building.
You need to do proper preparation BEFORE you paint the walls. This will include removing all grease and striping off old paint. Then paining the walls with primer and or undercoat before applying the topcoat. The paint tin instructions will detail what you have to do.
It depends on the base of the paint. If it's an ordinary house paint, you should be able to peel it off.
You cannot rub off paint from brushed aluminum wheels. In order to remove said paint, you will have to use a chemical solvent.
Use the thinner from that paint, or use Goof Off.