Paints that are dedicated for exterior use have concentrated mildewcides and fungicides that could have heath risks if used indoors. Plus, exterior paints have more VOC?s, which means the paint will have a potent smell when compared to its interior counterparts.
Exterior paints, especially acrylics, are designed to fast dry and resist the worst that the environment can offer. Because of this, exterior paints won't easily flow out smoothly on a surface and will more difficult to use. Many quality interior paints have the same great attributes as exterior paints without the health risks or problems of exterior paints.