Calico
I use my fingernail to press the seams, however it has ruined them! :lol:
I'm currently in the process of purchasing a wooden iron to use instead, I've seen the plastic ones but would prefer a wooden one.
When I first did PP some of the ladies in my class used an iron on low heat but as Roben said the heat from the iron could transfer the ink from the printed pattern onto your fabric.
Also the heat could distort your fabric :shock:
Hope this helps.
Tisha