Best Press is the answer. It is Mary Ellen's Best Press.
I use it all the time in piecing. and for final press.
It never flakes and also give a wonderful lavender scent to my work as I sew. On the internet and some stores it is expensive...$7.95 a bottle.
However check Hancock Fabrics, I bout 8 bottles a few weeks ago on sale for less than $4 a bottle....they do this several times a year.
They have it in other scents as well.
Diana