I. Paint Can Replacement Cycle
1. Unopened Paint Cans
Water-based paints (such as latex paint): Shelf life is usually 1-3 years. Check the can for bulging or seal failure.
Oil-based paints (such as alkyd paint): Shelf life is 2-5 years. If separation, clumping, or unusual odor occurs, discontinue use immediately.
2. Opened Paint Cans
It is recommended to use within 6 months after opening, as exposure to air accelerates oxidation and deterioration.
If stored improperly (e.g., high temperature, humidity), replacement may be necessary even before the expiration date.
II. Influence of Can Material
Metal cans: Replace if rusted or deformed. They can usually be reused for 3-5 years.
Plastic cans: Aging cycle is 2-5 years. Discard if cracks or discoloration appear.
III. Visual Criteria for Determining Replacement
Paint condition: Replace if the paint becomes gel-like, severely separated, or has sediment that cannot be stirred.
Spraying effect: If the paint has poor adhesion or uneven gloss, it may be due to deterioration.
IV. Suggestions for Extending Service Life
Store in a cool, dry place, away from direct sunlight.
For oil-based paints, periodically invert the can to prevent sedimentation and solidification.
