I too use Niagra Spray Starch in the non aerosol bottle. I keep a empty bottle on hand and cut it 50/50 with water. I do this as it cuts down on flakes and I do not care for the "stiff as a board" feeling that the straight starch gives me.
I know I know ...if you spray the starch and let it sit ans completely soak in - you don't get flakes but patience has never been a virtue of mine - lol!! So the 50/50 works great for me.