Yes, all true!

If you are doing production, you can save time and chemicals by heating the
sulfuric to something like 90-100 degrees and then put a LITTLE bit of
hydrogen peroxide in it at the time you put in the wafers.  Ammonium
persulfate works even better.  BE CAREFUL!  Consult your safety people. Wear
safety equipment!  You do not want this stuff on your person!

If the resist coating is quite thick, the wafers may want to float out of
the etch baskets.  You might want to experiment with dummy wafers before
risking important ones.

Roger Brennan