Look for visible deformation or corrosion that indicates a can may fail under pressure.

Start by placing the can on a flat surface and rotate it slowly to inspect the entire shell for dents, bulges, or creases that change the metal profile; a dent deep enough to crease the metal weakens the structure and requires disposal. Check for surface rust and flaking corrosion, especially around the bottom rim and seams, because rust indicates metal loss and hidden pitting that can lead to sudden rupture during recharging. Inspect the valve and actuator stem area for corrosion, bent stems, or hardened residue; a corroded stem can bind or leak and create an unsafe pressure path. Look for any wet spots, residue, or bubbling paint that could indicate a previous leak or internal reaction; allow the can to sit in a well ventilated area and recheck after wiping it dry to confirm the source. Gently press the top of the can around the valve with a gloved finger to feel for soft spots or cracking noises that signal thinning metal or internal damage. If you have a small handheld flashlight, shine it along seams and the bottom lip to reveal hairline cracks or perforations that are not visible in ambient light.

The three most common issues are dents that compromise structural integrity, rust or corrosion that reduces metal thickness, and damaged valves that leak or stick. For dents, do not attempt to hammer or reshape the can; disposing of it safely at a household hazardous waste facility is the correct action. For rust or corrosion, avoid trying to sand or patch the area because you can create sparks or further weaken the metal; place the can in a sealed container and take it to a local disposal point. For damaged or corroded valves, do not attempt field repairs or replacement seals; any valve that does not move smoothly or shows material breakdown should be considered a failure and the can should be taken out of service.

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