You could try Cornflour dough apparantly it's easier and doesn't crack in years to come. I did salt dough yesterday but I'm going to try the Cornflour aswell x
I’ve had the same problem, mine were in oven for 6 hours. Painted them and then they went soft. Apparently you can buy clay from Amazon ect and that is easier and better to cook/ paint x
My sister had the same problem. She said it was because it was you thick? I haven't had time to do mine yet. I was planning to let them air dry but I might wait to hear what anyone else says first and just abandon it haha