If a used scuba cylinder has been repainted, ask for the original cylinder identity, a record of the refinishing work and an assessment by a qualified cylinder service provider. A fresh finish may tell you what the outside looks like today. The work record should say who applied it and which cylinder and manufacturer instructions it covered.
Find out which equipment the work covered
Ask the seller when the finish was changed, why it was changed and whether the service provider documented the work. Request photographs where the original permanent markings can be read without scraping or removing anything. Luxfer’s cylinder visual inspection guide records information such as the cylinder serial number and original and latest test dates. A qualified provider can use those records alongside the actual cylinder. If a seller cannot identify it, pause the purchase while a provider reviews the available information.
Read the scope of any manufacturer document the seller supplies. Luxfer’s refinishing bulletin, for example, covers particular Luxfer cylinders made from its 6061 aluminum alloy and describes precautions around the threads and valve connection. Its instructions address the equipment within that bulletin’s scope. Get the actual cylinder maker’s documentation for a different model.
Ask what the finish may obscure
Give the service provider the actual markings, any photographs from before the work and the written process record. Ask whether it needs to see the cylinder before advising on purchase or filling. WorkSafe Queensland’s alert about portable aluminum cylinders specifically calls attention to heat exposure during repainting. If the seller cannot explain how the work was done, tell the provider that the process is unknown. Leave any decision about further inspection to the provider.
Keep three records together. Save the manufacturer identity, the refinish record and the later qualified inspection. A receipt for paintwork records an appearance change. It cannot establish an inspection outcome. When the seller offers only a photo of the new finish, budget for an assessment before treating the cylinder as usable.
If comparing the used cylinder with a new configuration, the TRIMIX T-500 product listing and model inquiry are places to request the markings and documents for the exact unit offered. A listing gives you a way to request evidence without appraising the unrelated used cylinder.
Evergreen buyer guide verified November 13, 2026. Sources: Luxfer technical bulletin on coating removal and repainting of specified 6061 aluminum cylinders (2007-01-16); Luxfer Guide to Scuba Cylinder Visual Inspection (September 1998 (second edition)); WorkSafe Queensland alert on portable aluminum alloy cylinders (2009-09-04).
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