Originally Posted by Onebyone

I have the long one with handle. I took a precision piecing class and the instructor told us put the iron on a seam leave it there for at least 30 seconds, take off the iron and put a ruler the size of the piece on top, put a book on top of that and let is set for up to 10 min or more until completely cool. Of course she made national quilt show quilts and it showed.

I use a thick wood cutting board for big blocks.