Cake Icing and Frosting: How to Choose the Right Finish for Every Bake

Buying cake icing and frosting can seem straightforward until you are faced with ready-to-use tubs, ready-to-roll icing, piping icing, buttercream icing and icing sugar. The wrong choice may crack when rolled, lose its shape on a warm kitchen worktop or leave you with far more product than your cake needs.

For UK home bakers, the practical choice depends on the finish required, the amount of decorating involved and how soon the bake needs to be ready.

Common buying pitfalls to avoid

1. Choosing by pack size rather than coverage

A large tub or bag is not automatically economical. A ready-to-spread frosting may cover one 20cm cake or several cupcakes, while a 1kg block of fondant icing is intended for a much larger covered cake. Check the stated coverage and serving guidance before comparing prices.

2. Confusing icing types

Ready-to-use icing is designed for spreading or piping with minimal preparation. Ready-to-roll icing is a pliable fondant used to cover cakes or shape decorations. Icing sugar is a separate ingredient for making buttercream, glaze or dusting finished bakes.

Using piping icing to cover a whole cake can produce an uneven finish, while trying to pipe a thick fondant may lead to tearing and poor definition.

3. Ignoring storage after opening

Some products need refrigeration once opened, while others should be wrapped tightly and kept in a cool, dry place. Moisture, heat and air can alter texture. Always follow the packaging instructions, particularly when baking ahead for birthdays, school events or family gatherings.

Core specifications to check before buying

Texture and intended use

For lettering, borders and small details, look for piping icing that flows steadily but holds its shape. The Morrisons Large Piping Icing Tube White 120g is supplied in a pre-filled tube, so it avoids the need for a piping bag and bowl. The product instructions recommend gently kneading the tube before use and replacing the cap tightly to reduce drying and clogging.

For a smooth cake covering, choose ready-to-roll icing. Morrisons Ready To Roll Icing 1kg is described as suitable for covering a 25cm round cake or a 23cm square cake at approximately 6mm thickness. It can also be shaped into simple flowers, figures and borders.

For spreading and filling, vanilla frosting, buttercream icing and cream cheese icing offer different flavour profiles. Cream cheese-style icing is commonly paired with carrot cake and red velvet-style bakes, while vanilla buttercream icing works with sponge, chocolate and cupcake recipes.

Quantity and cake dimensions

Measure the cake before purchasing. A product that covers an 8-inch cake may be suitable for a standard sandwich cake but not a tall or heavily decorated celebration cake. Cupcake coverage also varies according to whether you want a thin swirl or a high piped topping.

For recipes made from scratch, icing sugar is a useful cupboard staple. Tate & Lyle Cane Icing Sugar is sold in 1kg and 500g packs and contains cane sugar and maize starch. The fine texture is suitable for dusting, glazing and preparing buttercream.

Ingredients and allergen information

Check the label for allergens and dietary suitability rather than relying only on front-of-pack wording. The Morrisons ready-to-roll product is listed as suitable for vegans and vegetarians, but the description notes that it may contain nuts due to manufacturing methods. Morrisons Vanilla Frosting lists no allergens, while Betty Crocker products state that they may contain milk.

Nutritional information also varies considerably. For example, the listed Morrisons Vanilla Frosting contains 417 kcal and 68.1g of sugars per 100g. These figures do not determine whether a product is suitable for a particular recipe, but they help you compare options and portion sizes.

Our Top Recommendations by baker profile

MATCH FOR: Budget-Conscious Starters

Morrisons Vanilla Frosting 400g

Why This Fits Their Persona: A ready-to-use option for first-time decorators, parents baking with children or anyone who wants to finish cupcakes without preparing buttercream from scratch.

How It Avoids the Trap

The 400g format is easier to match to a small cake or cupcake project than a bulk pack, and the tub can be stirred and used directly.

Key Advantage & Pros

Vanilla flavour; suitable for spreading or piping; refrigerate after opening and use within 30 days.

MATCH FOR: Premium Quality Seekers

Betty Crocker Cream Cheese Icing 400g

Why This Fits Their Persona: Suits bakers who want a distinctive cream cheese flavour for carrot cake, red velvet-style cakes and cupcakes without making a separate icing mixture.

How It Avoids the Trap

The pack states that it is ready to spread and can cover and fill an 8-inch cake or cover up to 27 cupcakes, giving a clearer basis for planning.

Key Advantage & Pros

Ready to spread; suitable for vegetarians; listed as gluten-free; refrigerate leftovers after opening.

MATCH FOR: Specific Use-Case/Heavy Users

Morrisons Ready To Roll Icing 1kg

Why This Fits Their Persona: A practical choice for larger celebration cakes, repeated decorating sessions and bakers who need fondant icing for both covering and modelling.

How It Avoids the Trap

The stated cake dimensions and approximate 6mm thickness help you assess whether the quantity matches your project before opening the pack.

Key Advantage & Pros

1kg pack; suitable for vegans and vegetarians; can be rolled, covered and shaped into simple decorations.

MATCH FOR: Detail-Focused Decorators

Morrisons Large Piping Icing Tube White 120g

Why This Fits Their Persona: Designed for lettering, borders, lace details and quick cupcake decoration when controlled application matters more than bulk quantity.

How It Avoids the Trap

Its pre-filled tube avoids estimating how much icing to place in a piping bag and reduces washing-up for smaller decorating jobs.

Key Advantage & Pros

120g ready-to-use format; white icing; no artificial colours listed; suitable for cakes, cupcakes and biscuits.

Practical decorating tips for better results

• Bring fondant to room temperature before kneading. The Morrisons ready-to-roll product recommends leaving it out for around two hours before use.
• Apply a thin layer of buttercream, jam or another suitable covering beneath fondant icing to help it adhere.
• Pipe only onto a fully cooled cake or cupcake. Warm sponge can soften the icing and affect the finish.
• Keep opened tubs sealed and refrigerate products where the label requires it.
• Store icing sugar and unopened fondant in a cool, dry place away from direct sunlight.

Frequently asked questions

What is the difference between icing and frosting?

In UK baking, the terms are often used interchangeably. Icing sugar is a fine powdered ingredient, while frosting usually describes a prepared spreadable topping such as vanilla frosting, buttercream icing or cream cheese icing. Fondant icing is typically rolled out to cover a cake.

How much icing do I need for a cake?

The amount depends on the cake’s diameter, height and decoration style. Check the pack’s coverage guidance. For example, the listed 1kg ready-to-roll product is intended to cover a 25cm round cake or a 23cm square cake at approximately 6mm thickness, whereas a 400g ready-to-use tub is aimed at an 8-inch cake or multiple cupcakes.

How long does cake frosting last after opening?

Storage varies by product. Morrisons Vanilla Frosting and Betty Crocker icing instructions state that opened leftovers should be refrigerated and used within 30 days. Ready-to-roll icing should be tightly wrapped and placed in an airtight container so it does not dry out or crack. Always prioritise the storage and use-by guidance printed on the packaging.