Small Tanks Corroding on the AP Valves BCD Commando, anybody has this too?

[Eric Sedletzky]

Thanks Eric for engaging with your knowledge. Much appreciated.
BTW, Sco is Scotland. It is the official abbreviation . I updated my profile for others that might not know.
Thanks I will give it a go. I need to see what I can get here, but am sure I find something.
To polish could I also use (in your humble opinion) the grit paste I use to polish and settle the valves of a cylinder head?

Yes you could possibly use valve dressing, but just a can of aluminum polish would probably be better.
In Scotland you may still be able to get the good aircraft stripper. Go to a body shop and maybe score a little from them so you don’t have to buy a whole big container.

 

[ChangeAgent]

In Scotland you may still be able to get the good aircraft stripper.

Is aircraft stripper a brand or a kind of stripper. Never heard of it.

 

[Eric Sedletzky]

Aircraft stripper is a type of stripper.
It’s very effective at removing tough two part polyurethane paints. Every time an aircraft needs to be painted the old finish needs to be completely removed for weight reasons, without sanding and upsetting any rivets etc.

 

[ChangeAgent]

Thanks Eric. I have a look for it. I am not sure if mine is coated in two part polyurethane paint, I shall find out.

 

[Eric Sedletzky]

Thanks Eric. I have a look for it. I am not sure if mine is coated in two part polyurethane paint, I shall find out.

I’m sure it is, but it was sprayed directly onto bare aluminum just to make it look pretty.

 

[ChangeAgent]

Hi Eric, I emailed with Luxfer (after all, your excellent explanations) and I think these links might also be of interest to other people with similar problems.

Paint removal and repainting of Luxfer all-metal and composite cylinders made from 6061 aluminum alloy (L6X®) - Luxfer Gas Cylinders

Cylinder OD cleaning procedure for brushed and unpainted cylinders - Luxfer Gas Cylinders

 

[happy-diver]

It is good you have shown us a clarity regarding powdercoating

"All-metal Luxfer 6061 aluminum alloy (L6X®) cylinders—Do not use acidic or caustic paints that may damage the cylinder exterior. You may use any neutral, air-drying or aliphatic, water-based or solvent-based liquid paint that is compatible with aluminum. You may also use neutral, aluminum-compatible powder coatings as long as curing temperatures and exposure times do not exceed those recommended by Luxfer. Please note that different aluminum alloys have different maximum-temperature specifications; for example, for Luxfer 6061-alloy (L6X®) cylinders, the maximum metal temperature must not exceed 350ºF (175ºC). Exposure times at various temperatures vary according to alloy. Please contact Luxfer for time/temperature information about the particular cylinder and alloy that you intend to repaint using powder coatings. Cylinders subjected to temperatures and exposure times exceeding Luxfer recommendations or heated to unknown temperatures must pass hydrostatic tests before being filled or used."