How to Cover a Cake with Fondant: A Beginner Guide
Start with a stable cake, measure the finished height and smooth the fondant in stages without stretching it.
Prepare the cake and your work surface
In UK shops, rolled fondant is often called sugarpaste or ready-to-roll icing. Choose a covering paste rather than gum paste or flower paste, which is made for decorations that dry hard. Follow the brand’s kneading and thickness guidance.
- A fully cooled, filled cake on a suitable board.
- A smooth coating of buttercream or ganache to support the covering.
- A smooth rolling pin, clean mat, ruler and fondant smoother.
- A sharp trimming tool and a small amount of the dusting material recommended for your paste.
Level the sponge and keep the filling inside the edges. Let the filled cake settle as your recipe recommends, then smooth the coating. Fondant follows the surface underneath: bumps, leaning layers and bulging filling are harder to hide after covering.
Measure the finished cake, not just the tin
Measure after filling and coating. The finished height includes the filling layers; a tall cake needs a larger rolled sheet than a short cake with the same diameter.
| Cake diameter | Finished height | Top + two sides |
|---|---|---|
| 15cm | 10cm | 15 + 10 + 10 = 35cm |
| 20cm | 10cm | 20 + 10 + 10 = 40cm |
| 20cm | 15cm | 20 + 15 + 15 = 50cm |
Allow for centring and trimming as your paste instructions advise, without rolling a much larger, heavy sheet that pulls on the upper edge. Fondant weight also depends on thickness. Use the fondant calculator for an estimate and a rollout size; choose the actual cake dimensions.
Estimate the paste weight and rollout size before opening a packet.
Roll, lift and smooth in manageable stages
- Knead the paste: work until pliable and even. Keep the unused portion wrapped so the surface does not dry.
- Roll evenly: lightly dust the mat as needed, then roll from the centre outwards. Turn and lift the paste regularly so it does not stick. Follow the brand’s recommended thickness; around 3mm is a common starting point for cake covering.
- Check the span: measure across the rolled sheet before lifting. Keep the thickness even at the edge as well as the centre.
- Lift with support: use the rolling pin to support the sheet and centre it over the cake. Let it drape rather than stretching it downwards.
- Secure the top and upper edge: smooth gently while supporting hanging paste so its weight does not tear the edge.
- Work down the sides: lift a pleat away from the cake, open it gently and smooth that section down. Turn the cake and repeat. Do not press a fold flat and expect it to disappear.
- Trim and finish: cut the excess near the board, then use the smoother with light pressure. Save clean trimmings wrapped for a small repair or matching decoration.
The first attempt does not need a razor-sharp edge. Aim for an even covering and a stable cake. A border can finish the base neatly after trimming.
What to do when the covering goes wrong
| Problem | First check | Useful response |
|---|---|---|
| Small cracks | Paste drying, too much dusting or insufficient kneading. | Try smoothing a small area with clean matching paste. Follow brand advice before adding fat or liquid. |
| Tear at the top edge | A hanging sheet is pulling, or the covering is too thin. | Support the weight. A small clean patch may work; a large tear may need re-covering. |
| Pleats at the base | Extra paste has been pressed into a fold. | Lift and open the fold before smoothing down that section. |
| Bulge under the covering | Filling or trapped air beneath the surface. | Check the cake structure. Extra smoothing pressure will not repair an unstable filling. |
| Sticky surface | Moisture, condensation or warm humid conditions. | Avoid rubbing or adding heavy dusting. Let the surface settle in suitable dry conditions. |
If removing the covering, avoid mixing a large amount of cake crumbs or coating into paste intended for reuse. A small repair hidden under decoration can be more practical than repeatedly handling the entire sheet.
Add the decoration and plan storage
Apply printed decorations only to a suitable surface using the supplier’s instructions. See icing sheets versus wafer paper before choosing a material. Wafer paper does not react to moisture in the same way as a flexible icing sheet.
Fondant does not remove the storage requirements of the cake or filling underneath. If the recipe needs refrigeration, keep it chilled and plan for condensation when moving to a warmer space. See the hot-weather guide when the venue or journey is warm.
Frequently Asked Questions
Is fondant the same as sugarpaste?
For cake covering, rolled fondant and sugarpaste usually describe the same type of ready-to-roll icing. Flower or gum paste is a different product intended for decorations that dry firm.
How big should I roll fondant for a 20cm cake?
Use the finished height. A 20cm diameter cake that is 10cm tall needs a geometric span of 40cm: 20cm across the top plus 10cm down each side. Follow the paste’s guidance for thickness and any trimming allowance.
Can fondant hide a lumpy cake?
It follows the shape of the coating below. Smooth the buttercream or ganache and stabilise the filling before covering; thicker fondant is not a reliable repair for a bulging or leaning cake.
Use the tool from this guide
Open the relevant CakeyTops tool and put the advice above to work straight away.
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