On Sunday, December 3, 2017 at 10:34:04 PM UTC-5, wrote:
My club just bought Schweitzer 1-23
Needs repaint
Best chemical to strip aluminum?

Product we find works best is Aircraft Stripper- yep that is the product name sold by Klean Strip. Lots of auto body places carry it. Uses methylene chloride.
It stinks, burns skin and should not be breathed(it raises blood pressure).
That said it takes paint off much better than the stuff they sell at Home Depot for stripping furniture by pregnant mommies.
Clean up is with slow drying lacquer thinner and Scotchbrite pads.
Scrape loose paint off with wooden scrapers onto newspaper. Let it dry off before putting into a garbage bag. Store discards outside in a metal container with the top off.
It takes 2 people a day to strip one side of a 1-26 wing and then some more time for good clean up before Alumaprep,Alodine, epoxy primer.
This doe not work well in cold. Do in heated shop.
Good Luck
UH