Paint
If you’ve been hanging on to that spare gallon from last decade’s paint project, you might want to use it now or throw it out. Because paint loses effectiveness over time, opened cans should be tossed out after four years, as should any paint that is dried out, moldy, or chunky. Unopened latex paint can be used for up to 10 years; unopened oil-based paint can be used for up to 15 years.
