Can I use an exterior paint inside the home, or an interior paint outside?
No. It is important to use products as they are labeled. Interior paints are not usually designed to withstand the sun’s rays, or bad weather, or contraction and expansion cycles of the substrates in changing temperatures. Exterior paints normally are not evaluated for indoor air conditions. However, if a product is labeled “Interior/Exterior,” then you can be confident of its performance in both environments.
