Old cans of interior paint may stay usable for many years if they have been kept tightly sealed and stored away from freezing temperatures. Evaluation old paint stirring it well, then brushing it on to old newspapers. If there are lumps in the paint, it is no longer good and ought to be discarded.
Paint’s Shelf Life
The shelf life of paint depends on the kind and whether the paint container was opened. Solvent-based oil or alkyd paints can stay usable for up to 15 years when they were not opened and always kept away from temperature extremes. Water-based latex and acrylic paints can stay good for up to 10 years if not opened and kept from freezing. Leftover paints that have been opened ought to be closed tightly, stored in a cool, dry place and used within two years.
Paint Gone Bad
Paints normally separate into solids and liquid during long-term storage. If you can stir the solids smoothly back into the liquid, then you can most likely use stored paints. However, if the solids have hardened on the bottom of the can and won’t mix with the liquid, then the paint is spoiled and should be discarded. Other indications that older paint has spoiled include a foul odor when the can is opened and visible mold and mildew in the paint.
Touch Ups or Undercoat
If the paints have been in colors you have in your property, keep them for touch ups and repainting of badly soiled areas. If you’ve got small quantities of many different colors, either move the paints into small containers and label them mix the leftovers collectively by paint type and utilize them as an undercoat at a future painting job. If you’ve got a lot of gallons of very good paint you don’t want anymore, provide it to friends, neighbors or relatives. Or contribute the good paint into a charity that does house renovations for needy families.
If you can’t use the previous paints give them off, repaint acrylic and latex paints with kitty litter before throwing them off. Mix one part paint and 2 components clay-based kitty mess and stir well. The paint should solidify in about an hour. For undesirable alkyd and oil-based paints, please consult your state or local environmental protection officials for dates and locations of hazardous waste collections.