How to Make Old Paint Reusable

Check systematically through all your old paint cans. Remove the lids using the end of a screwdriver and check the contents. Separate the cans into two sections: reusable paint and throw-away paint. For example, if the paint can contains less than 1 inch of paint, it's probably dry and not reusable. Alternatively, if the can has more than 1 inch and isn't dry, you may be able to reuse it once you've tested it.

Remove the "skin" from old oil-based paint. Pull the skin to one side, using a stick. Lift it out of the can and dispose of it. Notice a layer of oil on top of the paint. Use the stir stick to mix the oil into the paint until the two amalgamate.

Mix old water-based paints, using a stir stick. Look for a layer of watery paint on the top. Stir this into the harder, bottom paint. If the paint is too thick, add a little water until it reaches the desired consistency. Reuse old water-based paints as a primer or undercoat, if desired.

Mix the contents of old paint cans together to make new colors. Create a new color by mixing two or more colors. For example, mix blue and yellow to produce green; or red and green to get brown. Experiment by mixing a small amount of paint together until you get your desired color.