The Painter is used for painting Wool, Sheep and cured Construction Foam. It can also be used on Insulated Wire and Cables to color code them and keep them from connecting. It is not for use with Pneumatic Tubes. To paint Pneumatic Tubes you will need a Paint Brush and Paint Can, which are part of the RedPower 2 Mod.
You can also put automatic refill mode on painter, by pressing your "mode change key" (You can find it in controls, default "M") button and same time pressing right click on air or solid block that cannot be painted. This allows your painter to automatically put dyes from your inventory on it.
Don't right-click on a computer with a painter. It can cause an Internal Server Error.
Painter + Dye
This works with any of the many Dyes
Right click the painter with desired color on the wool, CF block or wire to change its color.
Note that a colored wire may still connect to an uncolored wire. To make sure the wires don't connect, paint them both with different colors. Also, a painter will not work on any uninsulated metal cable such as Ultra-Low-Current Cable etc., however Glass Fiber Cable can be painted.