I do like their Purge-All and Purge-All +, but have not tried the Purge Sinter. Will have to order some.
I feel like i'm getting my moneys worth Patrick because they give me a little free crucible with it , lol . The one thing I don't understand is the temperature at which you purge ,,,,,,,only 800 c for ten mins . The material changes colour so I guess it's absorbing something ,,,,,,If nothing else it's absorbing my $80 each time I need a new tub .