Why Your Fondant Sweats in Humid Weather (and How to Fix It)

Fondant looking shiny, sticky, or a little “wet”? You’re not doing anything wrong — this is one of the most common issues beginner decorators face, especially here in Perth when the humidity spikes.

The good news: it’s completely normal, totally fixable, and easy to prevent once you understand what’s happening.

What Fondant Sweating Actually Is

Fondant is made from sugar, and sugar naturally attracts moisture from the air. When the weather is humid, the moisture in the air settles on the surface of your fondant, creating that shiny, sticky look.

This is the same reason cold drinks sweat on a hot day — it’s just condensation.

You’ll usually notice:

• A glossy shine
• Sticky patches
• Slight tackiness when you touch it
• Sometimes tiny beads of moisture

It can look alarming, but it won’t ruin your cake.

Why It Happens (The Simple Science)

Fondant sweats when:

• The air is humid
• The cake moves from a cold fridge to a warm room
• There’s a sudden temperature change
• Moisture in the air condenses on the sugar surface

Perth’s summer humidity is a big culprit — even experienced decorators deal with this.

How to Fix Sweaty Fondant

The most important thing: don’t wipe it. Wiping can drag the surface, leave marks, or create texture issues.

Instead, try this:

✔️ Let it sit at room temperature

The moisture will evaporate naturally as the cake adjusts to the room.

✔️ Use a small fan

A gentle fan helps the surface dry faster without affecting the fondant.

✔️ Avoid touching it

Fingerprints will show up easily when the fondant is tacky.

Within 10–30 minutes, the shine usually disappears on its own.

How to Prevent Fondant Sweating

A few small habits make a big difference:

✔️ Avoid sudden temperature changes

If your cake has been in the fridge, let it come to room temperature slowly.

✔️ Work in a cool, dry space

Air‑conditioning (not an evap) or a dehumidifier helps on humid days.

✔️ Dust your hands and tools

A tiny amount of corn flour keeps the surface smooth while you work.

✔️ Don’t store fondant cakes in very cold fridges

The colder the cake, the more condensation forms when it comes out.

Real Example: My Own Shiny Fondant Cake

See my red and black cake picture at the top of my blog.

This is a perfect example of what fondant sweating looks like in real life. It dried beautifully within minutes once the cake settled — and yours will too.

Final Thoughts

Fondant sweating is completely normal and happens to every decorator, no matter their skill level. Once you understand the role humidity plays, it becomes easy to fix and even easier to prevent.

You’re doing great — sometimes it’s just the weather, not your skills. 💛