Rick, how will you be curing future thin walled bowls? What do you mean by not curing?

Chris-I'll be popping them into a water bath.Then,a week in it,then transfer to my curing "tent"for misting for the next couple of weeks.With the mix,I had not been curing at all when doing other pieces.There seems to be no clear concensus on what to do when you use 100% admix!
Cheers from here

I think you would be far better off using some water in your recipe. Admix is an additive that speeds up curing, provides additional strength to the finished product, helps to retain water within concrete during curing, and usually provides additional waterproofing to the finished concrete. What it doesn't do is provide the water that is needed for curing. 100% admixes aren't really used in industry but I don't see soaking afterwards as being a substitute for having some water available in the initial mix. Of course there are as many admixes as hypertufa recipes, some may work better than others without any water.

I'm going to try a 50/50 mix,water and admix,in one experiment.I emphasize though,that the cracked products have had no curing other than in the air.This won't happen again!With masks,I do use about 25% admix,and have had no cracking with them(cured properly!).I'll report back on the experiment in about 45 days.Don't have time for a week or so to do bowls,and there's no pressure as the last show of the year is next weekend!
But...
I'll get it right!
Cheers from here

Thanks for the info Rick.

Good luck at the show!