antique diver wrote: ↑Sat Oct 16, 2021 12:00 pm
No regulations about that kind of painting as far as I know. It cannot hurt the metal. Finishes requiring a heat cure is a different story. Luxfer says that any cylinder heated to 350 F. should be condemned.
I mainly spoke up to suggest that there should be regulations against ignorant dive shop personnel.
I have to agree.
AFAIK, Painting scuba cylinders got a bad reputation due to two incidents in Florida (on the same day).
There were two cases in Florida, where two cylinders ruptured due to heat related paint that ruined the aluminum heat treatment. Like Bill mentioned, aluminum can be ruined with temperatures as low as 350F.
The incident was a while back, I think in the 80's. Both cylinders belonged to the same person.
The story as I remember it, is that one blew up in one dive shop. It didn't hurt anyone, but it did a lot of damage to the dive shop.
The owner of the cylinder was pissed that his cylinder blew up, but he decided to take his other cylinder to a second dive shop, on the same day. If I recalled someone did get killed in the second dive shop.
These were aluminum cylinders, but differentiating aluminum from steel can be too technical for some dive shop owners.