I don't typically use starch when sewing or ironing, but when making a shirt with homespun plaid it became very evident I needed some! I'd seem homemade spray starch recipes before, so instead of running to the store, I just whipped some up at home! The extra benefit to making my own (besides the cost savings) is that I was able to use a starch safe for my allergic little guy. :)
This is the recipe I used:
* 1 cups water
* 1 teaspoon arrowroot starch (you can use corn starch instead)
Bring the water to a boil and dissolve the starch completely. Let cool and transfer to a spray bottle.
Shake your bottle before use, spray generously on fabric and press with a hot, dry iron.
It created such a stiff fabric and made placket and sleeve cuff insertion so much easier! I've seen recipes say to only keep this for a couple days, then make a new batch, because it may go rancid. I haven't needed to use it again much since I mixed it up about a month ago, but did check mine and it seemed absolutely fine. I probably will go ahead and mix up a new batch just before a project requiring a lot of starch, just to be careful.