Flat collars, limp hems, and floppy craft fabric waste your time fast. This homemade heavy spray starch gives fabric crisp body with pantry basics and a few minutes on the stove (which is still less irritating than buying another can that sputters out halfway through ironing). You can use it for laundry or for craft projects that need a firmer finish.
Store-bought heavy spray starch can cost about $2.17 for a 20-ounce can at Walmart, while 1/4 cup of cornstarch from a $1.92 sixteen-ounce box works out to roughly 24 cents for the starch in this batch. Making it yourself also lets you skip the aerosol can, control the thickness, and add lemon juice only if you want a preservative for longer storage.
You only need 3 materials for the basic starch and one optional preservative if you plan to keep it longer. This batch makes 1 full quart, and you’ll just need a saucepan, a spoon or whisk, and a heat-safe container or bottle for cooling and storing it.
- 🧰 Materials You'll Need
- 🔧 Tools & Equipment
- 🛠️ How to Make Heavy Spray Starch
- 🛠️ How to Use It
- 🎨 Customization Ideas
- 🛡️ Safety and Care
- 📦 Storage
- 💸 Cost Breakdown
- 🛍️ Need Help Finding Everything?
- ❓ Frequently Asked Questions about MYO Heavy Spray Starch
- 📌 Love this MYO Heavy Spray Starch? Pin it!
- 🖨️ Print-Friendly How-To: MYO Heavy Spray Starch
Materials You’ll Need
- 1/4 cup cornstarch
- 1/2 cup cold water
- 1 quart boiling water
- 1 tablespoon lemon juice, optional, if storing for any length of time
Tools & Equipment
- Medium saucepan
- Spoon or whisk
- Measuring cups
- Storage bottle or jar
How to Make Heavy Spray Starch
- Dissolve the cornstarch in the cold water, stirring well until the mixture is smooth.
- Pour the dissolved starch mixture into the boiling water.
- Bring it to a boil, then cook for 2 minutes over medium heat.
- Remove the pan from the heat and let the starch cool.
- If you plan on storing this for any length of time, stir in 1 tablespoon of lemon juice as a preservative.
- Pour the cooled starch into a storage bottle or jar and use it for laundry or crafts.
This makes a heavy starch, great for laundry or crafts.
How to Use It
- Spray or apply it to fabric before ironing when you want extra body and crispness.
- Use it on craft projects that need a stiffer finish.
- If you want more homemade laundry ideas, see Make Your Own Laundry Detergents, Stain Removers, Pre-Wash Sprays and More!.
- For lighter options, you might also like Laundry Starch Spray or Starch for Crocheted Baskets and Favors.
Customization Ideas
- For laundry: Keep the basic formula as written for a crisp, heavy finish on collars, cuffs, linens, jeans, and cotton items.
- For crafts: Brush or apply the starch where you need structure on decorative fabric projects.
- For longer storage: Add the optional tablespoon of lemon juice.
- For smaller batches: Cut the formula in half if you only need enough for one project or one ironing session.
Safety and Care
Let the starch cool before pouring it into a bottle or jar so you don’t warp the container or splash hot liquid on yourself. If you’re storing it, keep the container clean and watch for any off smell, visible mold, or separation that doesn’t remix well. Mold can grow even in acidic foods and mixtures, which is a good reminder not to keep homemade wet mixtures indefinitely once they start looking questionable. The USDA notes that molds can thrive in high-acid foods, so if this starch shows spoilage, discard it rather than trying to save it with a shake or reboil: Molds on Food: Are They Dangerous?.
Storage
Store the cooled starch in a clean bottle or jar. If you plan on storing this for any length of time, add 1 tablespoon of lemon juice as a preservative to help prevent spoilage or mold. If the starch sits, shake or stir it before each use so the mixture goes back together evenly.
Cost Breakdown
A comparable heavy spray starch at Walmart runs about $2.17 for 20 ounces. This homemade batch uses about 1/4 cup cornstarch, which works out to roughly $0.24 in cornstarch based on a $1.92 sixteen-ounce box. Water adds only pennies at most, so this quart batch stays very inexpensive even before you factor in that you’re making far more than a single 20-ounce can.
🛍️ Need Help Finding Everything?
Frequently Asked Questions about MYO Heavy Spray Starch
Yes, once the starch has cooled. Since this is a heavy starch, test your sprayer first. If the nozzle clogs easily, use a bottle with a sturdier trigger sprayer or apply it another way for craft projects.
The cornstarch-to-water ratio gives this batch a firmer finish than lighter spray starch formulas. It is meant for projects or fabrics where you want noticeable body and crispness.
No. The lemon juice is optional and only suggested if you plan on storing the starch for any length of time. If you’re making it to use right away, you can leave it out.
Mixing cornstarch with cold water first helps it dissolve smoothly before it hits the boiling water. That simple step cuts down on lumps, which makes the finished starch much easier to use.
Yes. This formula is specifically described as great for laundry or crafts, so it’s handy when you want to stiffen fabric for decorative projects too.
Shake it well or stir it before using it again. Cornstarch mixtures can settle as they sit, so a quick remix usually brings it back together.
If you notice mold, an off smell, or a texture that seems clearly wrong and won’t smooth back out, discard it. Homemade wet mixtures are cheap to remake, and that’s the better call here.
Yes, as long as you keep the same ratio of cornstarch, cold water, and boiling water. Use a larger saucepan so it doesn’t boil over.
Usually, yes. Even using current store prices, the cornstarch for one batch costs only a fraction of a ready-made can, and this recipe makes a full quart.
📌 Love this MYO Heavy Spray Starch? Pin it!
Did you try this project? Tell us how you used your heavy spray starch, or whether you made it for laundry, crafts, or both.
🖨️ Print-Friendly How-To: MYO Heavy Spray Starch
MYO Heavy Spray Starch
Equipment
Materials
- ¼ cup cornstarch
- ½ cup cold water
- 1 quart boiling water
- 1 tablespoon lemon juice optional, if storing for any length of time
Instructions
- Dissolve the cornstarch in the cold water, stirring well.
- Pour the dissolved starch mixture into the boiling water.
- Bring to boil.
- Cook 2 minutes over medium heat.
- Remove from heat and cool.
- If you plan on storing this for any length of time, add 1 tablespoon lemon juice as a preservative.
- Pour into a storage bottle or jar.
- Use for laundry or crafts.
- This makes a heavy starch, great for laundry or crafts.
- Lemon juice is optional and intended as a preservative for longer storage.
- Let the starch cool before bottling.
- Discard the mixture if it develops mold, an off smell, or obvious spoilage.
Forgive me for asking. Just starting to use this website. Are you placing this in a spray bottle for use?
Fill mouth full then spit slowly at material.
Drop the snark, please! A heavy starch might clog a spray bottle. Therefore, a sprinkler bottle might work better in this case.(that’s what our great grandparents used) You can make your own or buy one.