Tool Guide for Cast-In-Place Concrete Worktops

Essential Tools for Pouring a Concrete Worktop

There are several key tools used when pouring and finishing a concrete worktop. Understanding what each tool does and when to use it is critical to achieving a clean, consistent result.

Magnesium Float

The magnesium float is the primary finishing tool used shortly after the pour, typically 30 to 60 minutes in.

Its purpose is to:

• Smooth the surface

• Level minor imperfections

• Draw the cream to the surface for final finishing

You should begin floating once the concrete loses its wet shine and starts to look dull. If the surface dulls again but is still too soft for trowelling, it is fine to float a second time.

Steel Finishing Trowel

The steel trowel is the final finishing tool used before the concrete fully hardens.

It is used to:

• Close the surface

• Densify the cream

• Achieve a smooth finished appearance

Only use the steel trowel once the concrete is dull, dry, and firm. Press your finger lightly into the surface. If it leaves no imprint, the concrete is ready.

Using a steel trowel too early can cause surface defects and weaken the finish.

Sanding Discs

Concrete worktops should be sanded before sealing to remove minor imperfections and prepare the surface.

Recommendations:

• Use an angle grinder with a dust extraction shroud

• Do not sand finer than 220 to 320 grit before sealing

Higher polishing levels can be achieved later if required, but overly smooth surfaces may prevent stains and sealers from bonding correctly.

Final Advice

Using the correct tools at the right time makes a significant difference to the final result. Poor timing or incorrect technique is the most common cause of surface issues.

If you are unsure about any stage of the process, contact us before proceeding. A quick check can prevent costly mistakes later.