It has a very slight sheen and is washable. Use this paint in the living room, family room, bedroom, or dining room. Use this paint in hallways, kitchens and bathrooms where there is high traffic and you need to clean quite often. This is also good for painting some furniture. Use in the same rooms as the semi-gloss.
Most jobs require two coats of paint.
A gallon of paint will be good for doing a room. If you're just painting shelves or furniture, a liter should do. Paint always dries darker than it appears going on. Depending on the project you want to do you might be able to get away with using craft paints or testers. Any hobby or craft store will sell 2-oz bottles of craft paint.