Joe is not the only one with this problem. Some, not all, my oak bowls have done the "oval thing." Soaked the nearly fully turned bowl (turned to 1/4 inch) overnight (24 hours) in a 1:1 solution and then finished the next day. The warping is not extreme, but is enough to seriously detract.
Deb
Leif Thorvalds> Hi, Joe: Your experience has been the exception. I would almost venture > a
bet that you didn't follow "Leif's instructions" to the letter. How about
> sending me an email with the exact procedure you used. I generally found
> that there were deviations in the procedure resulting in warping or > cracking. >
> Leif
>> Howdy:
>> I have used the Costco dish detergent as per Leifs instructions. >>
>> I turned several cherry bowls, after the appropriate soaking.
>> Immediately finishing them afterwards. None exhibited cracking.
>> They all look nicely oval and raised up at the end grain end
>> Joe
>>