Shrink Fitting

Aluminum can become crystallized with extended heat soaks as low as 350deg f.
Remember a couple of scuba tanks exploding, years ago, after a coat of a low temperature ceramic-like coating
They had to be held at temp for around 24hrs but as the temp was 350deg the people involved thought it would be safe.
One person lost a leg!

Bill Gruby- Like your advise.
Bill C - I should have mentioned how dangerous such liquids are. Glad you did. Everything should be perfectly organized to eliminate an accident.
 
Thanks everyone for your input especially Bill G for first hand knowledge of freeze spray, I think I will stay with heating it on the hot plate and putting the small parts in the freezer for 24 hrs .

Brian.
 
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