The steam method is how ALCOA found out that steam seals the anodizing.
Seems they had plain anodized cafeteria trays. Coffee would be spilled on
the tray. The coffee stain could be washed off most except for a few.
Alcoa was perplexed until they found that if the tray was set over the steam
table, then the coffee stain became permanent. Got this from an ALCOA movie
when I was trying to teach science to non-believers.


--
Cy Galley - Chair,
AirVenture Emergency Aircraft Repair
A Service Project of Chapter 75
EAA Safety Programs Editor - TC
EAA Sport Pilot
"RST Engineering" wrote in message
...
You mean like holding it over a pan of boiling water on the kitchen stove?
How long in time?

Any more details or a point to a url?

Jim


"Cy Galley" wrote in message
news:AXzTf.39602$oL.16416@attbi_s71...
The Sealing of anodized aluminum is very simple... Steam!