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How to paint marble 
Choose a well-ventilated area and protect your workspace. 
If the item can be moved, you may want to take it outside or to a garage or patio. If it can't be moved, open plenty of windows and doors and turn on fans to ventilate the area.
You can also wear a respirator. To prevent drips from staining your floor, lay out a drop cloth or old blanket under the item.