What’s the Best Paste to Use in Moulds – Fondant, Modelling Paste, or Something Else?

Whether you’re creating detailed embellishments, sweet treats, or sculpted cake toppers, getting clean, professional results from your silicone moulds starts with one thing: using the right paste.

But with so many options — fondant, sugarpaste, flower paste, modelling paste, modelling chocolate, even rolled buttercream — it’s easy to feel confused.

So, what’s the best choice?

We’ve tested every option on the market over the past 15+ years, and here’s what you really need to know:

Let’s Clear This Up First: Fondant vs. Sugarpaste

In the UK, the terms fondant and sugarpaste are often used interchangeably. They both refer to a smooth, pliable icing used to cover cakes and model shapes.

In the US, “fondant” usually refers to rolled icing, while “sugarpaste” can be a more general term.

But here’s the key takeaway: not all sugarpaste is made equally, and many off-the-shelf supermarket brands are too sticky, too soft, or too dry for moulds.

 

Our Recommendation: Karen Davies Sugarcraft Marshmallow Sugarpaste

Developed specifically for use with high-detail silicone moulds, our own-brand paste is a dream to work with:

✅ Smooth and non-sticky
✅ Holds fine details beautifully
✅ Easy to knead and roll
✅ Doesn’t crack or dry too quickly
✅ Ideal for beginners AND pros
✅ Vegan, vegetarian, gluten-, dairy- and egg-free
✅ Can be frozen and reused — excellent value!

It’s also delicious — with our marshmallow flavour being a customer favourite that converts even die-hard fondant-haters.

 

Flower Paste – Delicate, But Tricky

Flower paste (also known as gum paste) dries extremely hard and is designed for very fine, thin work — think lifelike petals or intricate lace.

However, it can dry too quickly in moulds, often cracking or tearing before you can get it out cleanly. It’s also not very forgiving, making it less ideal for beginners.

Use it only for projects where ultra-fine details are needed — not for general mould work.

Modelling Paste – A Blend of Strength and Flexibility

Modelling paste is usually a blend of fondant and Tylo (CMC) powder. It’s firmer than fondant alone, making it great for figures and 3D work, where you need shapes to hold their form.

It can work in moulds too — but if it’s too firm, you may struggle to press it into fine details. For the best of both worlds, we recommend starting with our sugarpaste and kneading in a pinch of Tylo powder if extra firmness or fast drying is needed.

 

Mexican Paste – Too Tough for Moulds

Mexican paste is often used for plaques or lettering because it dries firm and flat. But in silicone moulds, it’s usually far too stiff, which means you won’t get clean impressions.

We don’t recommend it for moulding.

Modelling Chocolate – A Dream to Use

Modelling chocolate is made from chocolate and corn syrup, giving it a flexible, smooth texture that’s fantastic for moulds. It holds detail brilliantly and doesn’t dry out as quickly, allowing more working time.

It’s also easy to blend seams and reshape without cracking. The only downside? It can soften in warm hands or humid kitchens.

Still, it’s a top choice for professionals — and we love it!

Rolled Buttercream – New Trend, Gorgeous Taste

Rolled buttercream is a softer, more butter-flavoured alternative to sugarpaste, made with butter, corn syrup and icing sugar. It’s amazing in moulds for those who don’t like fondant, and adds a rich, creamy taste to your decorations.

See our Recipe!

Want Strength? Add Tylo Powder

If you’re after more structure and quicker drying (especially for figures or standing pieces), knead a small amount of Tylo (CMC) powder into your paste. It transforms our already perfect sugarpaste into a firm, fast-setting modelling paste — without losing its softness or workability.

In Summary – Best Pastes for Silicone Moulds:

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Created with love by a leading UK cake artist & her award-winning daughter. Proudly family-run for over 15 years.
✨ When you use Karen Davies moulds, you’re crafting with the best.