Why Do Salt Dough Ornaments Crack or Puff Up? 9 Causes and Fixes

By Jess Harper Updated 6 min read

Why do salt dough ornaments crack or puff up? Most of the time the oven was too hot, the dough was too thick or uneven, or the pieces dried too fast. Drying low and slow at 200 to 250°F and rolling an even 1/4 inch fixes most of it. This guide covers 9 causes, a drying chart and how to patch a crack that has already happened.

Why do salt dough ornaments crack: salt dough ornaments in star, tree, heart and circle shapes cooling on a wire rack on a wooden counter Save

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Key takeaways

  • Puffing is trapped steam: too hot an oven, self-rising flour or dough thicker than 1/4 inch.
  • Cracks come from uneven drying: dry dough, no kneading, uneven thickness or heat that is too fast.
  • Dry at 200 to 250°F and use the tap test: hard and hollow means done.
  • A cracked ornament can be filled with craft glue and painted over.
  • Salt dough is not food and can poison dogs, so hang ornaments high.
In this post9 sections
  1. Why Do Salt Dough Ornaments Puff Up?
  2. Why Do Salt Dough Ornaments Crack?
  3. Why Do Salt Dough Ornaments Break Later?
  4. How Long to Dry Salt Dough Ornaments
  5. How to Fix a Cracked Salt Dough Ornament
  6. Salt Dough Cracking Myths and Facts
  7. Salt Dough Safety: Not Food, and Keep It Away from Dogs
  8. More Salt Dough and Handprint Craft Ideas
  9. FAQ

Salt dough ornaments crack or puff up for a short list of reasons: the oven was too hot, the dough was rolled too thick or too uneven, the dough was too dry or not kneaded, or the pieces dried too fast. Most of these are fixed by drying low and slow and rolling an even 1/4 inch. If you still need the recipe, start with our salt dough ornaments how-to.

Quick facts: why salt dough ornaments crack or puff
QuestionShort answer
Why did mine puff up?Oven too hot, self-rising flour, or dough thicker than 1/4 inch
Why did mine crack?Dough too dry, not kneaded, uneven thickness, or dried too fast
Best oven setting?Low and slow, about 200 to 250°F (95 to 120°C)
Best thickness?An even 1/4 inch (about 6 mm), or 1/2 inch for handprints
Can a crack be fixed?Yes, with craft glue or a dab of fresh dough, then paint over it
Is it safe to eat?No. Salt dough is not food, and it is dangerous for dogs
Two salt dough star ornaments on baking parchment, one puffed and bubbly and one flat and smooth Save
The puffed star on the left baked too hot. The flat one on the right dried slowly.

Why Do Salt Dough Ornaments Puff Up?

Puffing is a steam problem. When the water inside the dough turns to steam faster than it can escape, the dough swells and bubbles. Three things cause it most often.

  1. Step 1: The oven is too hot

    Above about 250°F the outside sets and browns before the inside has dried, and the trapped steam blows the surface up. Bake at 200°F if you can, and expect 2 to 3 hours.

  2. Step 2: The flour has a raising agent

    Self-rising flour contains baking powder, so the dough rises like a cookie. Use plain all-purpose flour and check the bag before you start.

  3. Step 3: The dough is thicker than 1/4 inch

    A thick piece dries from the outside in, so the middle stays wet and puffs or stays soft. Roll to an even 1/4 inch, and use 1/2 inch only for handprints, with extra baking time.

    Salt dough rolled between two wooden guide strips with a star cookie cutter pressed into it on a floured wooden counter Save

Why Do Salt Dough Ornaments Crack?

Cracks come from uneven drying, because the dough shrinks as water leaves it. Anything that makes one part dry faster than another can split the piece.

  1. Step 1: The dough is too dry

    Crumbly dough has no stretch, so it splits at the edges when it is cut or dried. Knead in a teaspoon of water at a time until it feels like soft clay.

  2. Step 2: The dough was not kneaded enough

    Under-kneaded dough has lumps and air pockets that become weak spots. Knead for 5 to 10 minutes until it is smooth.

  3. Step 3: The thickness is uneven

    Thin edges dry first and pull away from the thick center, which makes curls and cracks. Roll between two guide strips such as chopsticks or paint stirrers so the whole piece is the same height.

  4. Step 4: The ornament dried too fast

    A radiator, a sunny window or a hot oven all dry the surface faster than the middle. Dry on a wire rack away from direct heat, and flip the pieces so both sides dry.

    A round salt dough ornament with a hairline crack running from the edge across the surface, on a wooden table Save

Why Do Salt Dough Ornaments Break Later?

  1. Step 1: The hole is too close to the edge

    A hole pushed in less than 1/2 inch from the edge snaps under the weight of a ribbon. Make the hole before drying, about 1/2 inch in, and widen it slightly because the dough shrinks.

  2. Step 2: The ornament was never sealed

    Salt dough soaks up moisture from the air, and then it softens and crumbles. After painting, seal every side, including the back and the edges, with a clear sealer. An adult should use any spray outdoors.

How Long to Dry Salt Dough Ornaments

Sources disagree on exact times, so treat these as a range and use the tap test. A fully dry ornament feels hard, sounds hollow when tapped and has no cool or damp spots.

Drying methods for 1/4 inch salt dough
MethodTemperatureRough timeNotes
Oven, low200°F (about 95°C)2 to 3 hoursLeast puffing; flip halfway
Oven, standard250°F (about 120°C)About 1 to 2 hoursFaster; watch for browning
Air dryRoom temperatureSeveral days, up to a weekFlip once a day; humid weather is slower
Air dry, then bakeOvernight, then 200 to 250°FShorter bakeHelps thick pieces and handprints
Salt dough Christmas ornaments in star, tree, bell and heart shapes drying on a wire rack beside a kitchen window Save
Drying on a wire rack lets air reach both sides.
An adult hand tapping a salt dough star ornament on a wooden table to test whether it is hard and dry Save

How to Fix a Cracked Salt Dough Ornament

A hairline crack is easy to repair, and a painted ornament usually hides it. A wide split or a snapped piece needs a bit more work.

  1. Step 1: Clean and fill the crack

    Brush off dust, then press craft glue into a hairline crack, or mix a small ball of fresh dough with a little glue and push it in. Scrape off the extra.

    A cracked salt dough heart ornament on newspaper beside a small bowl of white glue, a paintbrush and a scrap of dough Save

  2. Step 2: Dry, paint and seal

    Let the patch harden for several hours, paint over it, then seal every side.

Salt Dough Cracking Myths and Facts

Reality

  • Low and slow drying prevents most puffing
  • An even 1/4 inch matters more than the exact recipe
  • A cracked ornament can be glued and painted
  • Sealing both sides keeps ornaments hard for years
  • Humid weather makes air drying take longer, not fail

Myth

  • A hotter oven dries ornaments better
  • Self-rising flour makes sturdier ornaments
  • Thicker ornaments last longer
  • Cracks mean the ornament is ruined
  • Paint alone protects them

Salt Dough Safety: Not Food, and Keep It Away from Dogs

Pets are at risk too. The ASPCA and the American Animal Hospital Association warn that salt dough ornaments can poison dogs, so hang them high on the tree and keep leftover dough in a sealed container.

Small ornaments and beads, glitter and sprinkles are choking hazards for children under 3, so skip them or keep them for older kids with an adult nearby.

A bare Christmas tree on a high mantel shelf hung with painted and sealed salt dough ornaments, out of reach Save

If you are planning a whole craft day, our handprint Christmas crafts, Christmas crafts by age and handprint gifts for grandparents all work with salt dough.

Salt dough ornament supplies

Frequently asked questions

Why do my salt dough ornaments puff up in the oven?

Usually the oven is too hot, the flour is self-rising, or the dough is thicker than 1/4 inch. Trapped steam swells the surface. Bake at 200 to 250°F with plain flour.

Why do salt dough ornaments crack while drying?

The dough shrinks as it dries, and uneven drying splits it. Dry or crumbly dough, uneven thickness and heat that is too fast are the usual causes.

What temperature should salt dough ornaments bake at?

Low and slow, about 200 to 250°F (95 to 120°C). At 200°F expect about 2 to 3 hours for 1/4 inch pieces. Flip them halfway.

How do you fix a cracked salt dough ornament?

Brush off dust, press craft glue or a little fresh dough mixed with glue into the crack, let it dry fully, then paint over it and seal every side.

Can kids eat salt dough?

No. Salt dough is not food and has a lot of salt, and it can poison dogs. Call Poison Help at 1-800-222-1222 if a child or pet swallows any.

Collage of salt dough ornaments: stars, hearts and circles cooling on a wire rack, a cracked round ornament and puffed versus flat stars on a baking tray

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About the author

Jess Harper, Founder & Editor

Jess Harper is the pen name of the independent publisher who founded Puddles & Play, used for its holiday crafts and for editing every post. Jess isn't a teacher or childcare professional, so posts are checked for age range, supplies and choking hazards against published child-safety guidance, with AI tools helping on research, drafts and images. Each post is checked against those sources before it goes live and updated when they change. Every activity is meant for adult-supervised play.

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