Yes, Mod Podge works well on air-dry clay as a sealer to add durability, a slight sheen, and help with water resistance, but it's best applied in thin, even coats after the clay is fully dry, using various finishes (matte, gloss) or specialized versions like Dishwasher Safe for functional items, though it's not truly waterproof for submersion and dedicated sealers might be better for high-contact uses.
Polyurethane is fine for air-dry clays and effective for waterproofing them too (also sealing them from critters, depending on the type of air-dry clay). That assumes however that you'd completely cover the (fully-dried) item, even down into any crevices/holes/etc. And you can add more coats if desired.
PVA glue (or white Elmer's glue) holds those tiny paper fibers firmly together when it dries. You can incorporate some PVA glue directly into the small chunk of clay and knead it. Or mix the glue with water and use this mixture instead of clear water while sculpting. This trick makes the clay very firm and durable.
I use multiple layers of Mod Podge. It's better than one thick layer because that can dry sticky. If you use a couple thinner layers it gives a hardened effect and feels smoother.
I mix clay and mod podge. It is very sticky in the beginning, but then I let it sit for 24h and it is the same as before but super flexible, dries a little faster and after drying it is more resistant to water and no cracking.
Can you use Mod Podge air dry clay? Mod Podge is similar to using PVA but a more upmarket version. It's a glue and sealer in one and is available in gloss, matte and glitter versions. Both of these options will add a protective seal but will offer little water resistance.
Use a clean, soft brush or foam brush to apply a thin layer of Mod Podge over your dried clay piece. Let it dry fully (it dries pretty fast – about 20-30 minutes). Apply a second layer if you want extra durability.
Some high-quality air dry clays can become quite hard when fully dry, but they're typically not as durable as oven-bake clay.
You're supposed to let this cure for 28 days for it to form a hard shell, but if you're impatient like me, you can cure it in an oven. How to cure dishwasher safe modpodge in an oven: In a cold oven, place your items on a baking sheet. Heat the oven to 175°F then bake for 1 hour.
Front only, then flip and tape the back.
The acidity of the vinegar breaks down the clay a bit, and makes it sticky.
Choose the Best Sealer for Air-Dry Clay
Polyurethane Varnish – Best for outdoor exposure. Epoxy Resin – Provides full waterproofing. Mod Podge – Offers light protection but is not fully waterproof.
How to bake air dry clay:
Once the clay has thoroughly dried, use a small amount of white school glue, Crazy Glue, or Gorilla Glue to adhere the Air-Dry Clay to the wood surface.
Air-dry clay might not be waterproof, but with some sealing magic, you can make it water-resistant and enjoy your creations for longer. Sealing with acrylic or polyurethane sealers is an excellent option for indoor projects or sheltered outdoor displays.
Just an FYI - Mod Podge takes a FULL 24 hrs to dry. Applying additional layers of Mod Podge before this drying time has elapsed will result in tiny BUBBLES forming on your project!
Mod Podge is not simply Elmer's or white PVA glue and water. It has a proprietary ingredient that gives it depth and texture when it dries, whether you choose matte or gloss finish.
Use a soft brush to apply the Mod Podge. While the Mod Podge is still wet, place the pattern on the surface and smooth it out. Avoid applying Dishwasher Safe to areas that come into contact with food or your lips, because although it is water-based and non-toxic, it is not approved as food safe.
Air-dry clay's main disadvantages are its fragility and brittleness (especially thin parts), lack of waterproofing, long drying times that can cause cracking, and its non-food-safe nature, requiring sealants for any functional use. It's prone to shrinkage, can get messy with water, and doesn't achieve the hardness or detail of kiln-fired clay, making it better for decorative rather than durable, functional items.
Crayola® Air-Dry Clay can be sealed once your piece is completely dry after 72 hours.
To mitigate the amount of cracks you can put a damp cloth over the clay when it's drying. The clay cracks because it doesnt dry evenly, some parts cure faster than others, the damp cloth makes it dry more evenly. Just let it rest overnight and come back the next day.
One way to seal air dry clay is by using a craft glue like Mod Podge or PVA Glue. This method is simple and easy, and all you need to do is brush a coat of the glue over the surface of your pieces. Plus it's non-toxic and once it dries, it will be sealed and give your creations a water resistant layer.
With air dry clay, it isn't kiln fired, so after painting, it can look a bit… dull. Well, I have some good news for you – Mod Podge does the trick. Not only does it provide an incredible shiny finish, it also strengthens the project itself.