press n peel blue question

[olslick]

if someone were to accidentally print on the wrong side of the blue paper, the shiny side, then printed it correctly after the fact, would this still work? the design printed on the shiny plastic side wouldn't bleed through would it?

[aziltz]

i've made this mistake before.  it doesn't work.  printing on the wrong side will cause the pnp to stick to the paper under the iron and you won't be able to move the iron without ripping up the pnp.

[KazooMan]

Never did that, but I have often placed a blank sheet of paper over the PNP blue before ironing.  It makes the iron slide much easier.  It should prevent any problems of sticking for you.

[aziltz]

the pnp will then stick to the paper, that was what i was trying to convey.

[olslick]

but if i used two sheets of paper...?

[aziltz]

but if i used two sheets of paper...?

no harm in trying, remember, if it doesnt work, just clean the copper and start over.

in my experience, and I make lots of PCBs, the more stuff between the pnp and the iron, the harder it is to transfer the toner.

[KazooMan]

Who cares if the glossy side of the PNP ends up stuck to the paper as long as the proper side is transferred to the box?  I don't save used pieces of PNP as reminders of builds past.  I toss them.  Having a sheet of paper stuck to them would not bother me in the least. 

Any household iron can easily generate enough heat to perform the transfer through the PNP and a sheet of paper.

To the OP:  One thing I would consider is that when you feed the PNP through your printer the second time the toner on the glossy side will pass over the fuser assembly and it could end up making a mess on rollers and such.

Speaking of pieces of paper, I never send a whole sheet of PNP through my printer.  It is too wasteful.  I make a print of the layout on regular paper and then cut a piece of PNP to size so it is a bit larger (with about 1/2" extra at the top.  I then attach the PNP to the paper (dull side up!!!) with double sided tape using the 1/2" I allowed You can do this either to the printed sheet, or lay a clean sheet over your print and look through it for alignment.  This sheet will feed through the printer just fine.  Just remember that the taped down edge goes in first.

If you have questions about doing it this way, or can't understand my description, let me know and I will take a few pictures of the process.

[aziltz]

Who cares if the glossy side of the PNP ends up stuck to the paper as long as the proper side is transferred to the box?  I don't save used pieces of PNP as reminders of builds past.  I toss them.  Having a sheet of paper stuck to them would not bother me in the least. 

Any household iron can easily generate enough heat to perform the transfer through the PNP and a sheet of paper.

I've made this mistake before and the transfer did not work because the paper wants to slide with the iron when you move it, and with toner on the shiny side, it sticks to the paper better than the copper.  some of the transfer goes down, and then it becomes misalligned.  perhaps you've had better luck.  i'm sure if you can do this very carefully and meticulously, you can iron without moving the paper and it might work, but it my case it wasn't worth the effort.

you can also clean the toner with acetone.  if you are careful enough, you can clean the toner off the shiny side.  however, acetone also dissolves the not-shiny side so I recommend wiping the shiny side with a paper towel that has some acetone sprayed on it, instead of brute force spraying acetone directly.