Article / Updated 02-16-2017
You can heat block your design by either ironing it or steaming it. Faster than wet blocking and spray blocking, heat blocking works best on natural fibers, such as wool and cotton, but you must take extra care not to burn the fibers.
Don't heat block fibers because they can melt, thereby ruining your design.Ironing it out
The ironing method of heat blocking works well for flat items, such as doilies, that have no three-dimensional stitches.