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My house has an old well room that is off of the main foundation of the house. I want to clean this space up to use it for storage and part of this process is to repaint the cement block walls.

The walls were already painted white long ago, but are now stained in areas and flaking. I want to repaint with some left over paint the I already have and am wondering which would be best to use. Interior latex satin paint or exterior latex satin paint?

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There is very little difference between interior latex and exterior latex enamels, the primary difference in exterior enamels is probably in some additional chemicals to help resist moisture as well as resist cracking and flaking due to extreme changes in temperature.

Moisture issues aside, concrete blocks will contract and expand greatly with temperature differences and an exterior latex paint is appropriate to withstand this without cracking.

To prevent peeling and flaking however you need a good surface for the paint to bond to, so I recommend using a wire bristle brush or a rotary tool with a paint scraping attachment to completely remove all areas where paint is peeling or flaking. Areas that are not peeling or flaking should be "roughed up" with your tool as well so that the new paint has a good surface to adhere to.

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You can use either latex paint, but after prep work, be sure to use a primer intended for masonry surfaces before applying the top coats or else it will just flake off again. –  bcworkz Mar 25 '13 at 20:34
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