[sdiy] PNP Blue questions

[aankrom]

I know I've posted about this several times before, but I want to get 
it right. I thought I'd saved the responses, but I can't find them 
anywhere. Googling how-to's with PNP are a tad unsatisfactory.

Which side to print on? Which is best iron temp? Time for ironing? 
Should I put a piece of paper in between the iron and the PNP? Is the a 
good way to tell if the design is transferring - that is, is there a 
good way to visually check if I've ironed long enough?

I plan on using FeCl3 for PC boards. Is this a good etchant for die 
cast aluminum as well? I want to etch the cases for the projects too. 
I've seen some examples and they look pretty cool. Some of the 
techniques use electric etching,but I don't see the need for this. Would 
peroxysulfate be a better etchant?

I'm sure trial and error will help, but I don't want to waste much PNP 
stock and I certainly don't want to mess up my nice laser printer.

AA