[KM480]

My shop is 40x40 and I can tell you that the more white walls the better. I found that using FRP (fiberglass resinous panelling) is much better than paint but more expensive. It is very durable and impervious to chemicals, at least the ones I have exposed it too. Easy to dust off once it gets a little dirty. I have the first four feet up covered with this stuff and am planning to use vinyl covered hardboard for higher up. This really helps reflect a lot of light.