The shelf life of paint depends on the type and whether the paint container has been opened. Solvent-based oil or alkyd paints can remain usable for up to 15 years if they were never opened and always kept away from temperature extremes. Water-based acrylic and latex paints can stay good for up to 10 years if never opened and kept from freezing. Leftover paints that have been opened should be closed up tightly, stored in a cool, dry place and used within two years. Paints normally separate into solids and liquid during long-term storage.
In addition to causing pain in the upper left abdomen, a few causes (bowel cancer, enlargement of the abdominal aorta, food poisoning, infection or kidney stones, trapped gases, etc.) may be the cause of pain in the left lower abdomen.
Other conditions that can cause upper left back pain include. 1  Respiratory conditions or lung infections can cause pain in chest and upper left back. 2  Skin conditions affecting skin and subcutaneous tissue like boils, abscesses, stings, bites etc. can cause upper left back pain.