And I would also suggest using starch when pressing. I, too, press after adding each piece of fabric to my block. I prewash my fabric so iron when it comes out of the dryer with starch at that point. If you've not gone through that process then I would recommend using starch when pressing after adding each piece. The starch will wash out once you've washed your completed quilt so no worries there. And I'm not sure than one can ever have too much starch in fabric when constructing a quilt!