Styrofoam is a basic element to many craft projects. It can be used with different shapes, styles, and mediums. However, because of its bland appearance, Styrofoam also often needs to be painted. This tricky item can be much more difficult to paint than it might seem.
The first rule for painting Styrofoam is to use the correct paint. Only craft paints that specifically state they work with Styrofoam can be applied to the raw item.
Every other paint, especially spray paint, can contain chemicals that will react with the foam. Regular spray paint on Styrofoam causes the foam to actually MELT, making huge craters and holes in the item, not to mention a rather unhealthy mess.
So if you have a Styrofoam friendly paint, you need to follow a few steps. Since Styrofoam has holes in it, paint does not just slide on smoothly. You must "scrub" the paint into the foam, working the color over the rough surface. This will usually mean you need to do two coats, one to get into the holes and one to smooth over the surface.
If you need to use a paint thats not Styrofoam friendly, you must first cover/seal the Styrofoam. There are many products used for this task, Plaster of Paris being the most popular. However you can also use products like Mod Pod or surface textures. The best product to use is "Foam Finish". It is easy to put on and can be thin or thick depending on the look desired.
When covering Styrofoam it can be difficult to keep a smooth shape. A perfect covering is done by applying the cover/seal in a thin layer and letting it dry. Then sand off any rough spots until the surface is perfect again. Then cover with another coat, let dry, and sand again. This should give you a perfectly shaped item with a strong cover.
After the covering is dry, you can apply any paint or other decoration desired without worrying about the Styrofoam reacting and melting away.
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