Because I can be impatient I have found that I have the best luck starching by using the following method because the starch really needs to soak into the fibers otherwise you have a mess. I spray my fabric and then roll it up and put it in a plastic bag to mellow. This is much like we did back in the day when we sprinkled clothes and ironed them. Remember the bag of sprinkled clothes in the fridge because you ran out of time? Letting them rest like this allows the starch to absorb into the fibers and you get more even distribution of the starch than you do by just spraying. You also avoid the flakes and gunky iron buildup. I just factor the sit time into my schedule and so something else in the meantime. The plastic bag keeps things moist but not wet.