How to fill a crack in concrete

Concrete may be a super strong construction material, but it can be prone to crack. It can crack for a number of reasons, from moisture, temperature changes and ground movement.

Do you have cracks in your concrete that need repairing?

You could hire a professional, but what you may not know is that repairing cracks in concrete is actually quite an easy, fast and satisfying project for any DIYer, so it’s something you may want to try at home yourself.

Not only does filling in your concrete cracks make the concrete look better, it helps keep out the elements, which serves to extend the life of the concrete too.

Need a little help? Lucky for you, we’ve prepared a simple and easy guide on how to fill a crack in concrete using Gripset Betta Concrete Crack Filler.

Gripset Betta Concrete Crack Filler is a unique solvent-free crack sealer designed to protect cracks and joints in concrete pavements against water ingress and the breakdown of pavement surfaces. Concrete Crack Filler penetrates into the depths of the crack, filling the void and sealing against moisture and water vapour. Once dried it forms a tough flexible seal that withstands ponding water and vehicle traffic.

Let’s get started.



Here’s what you’ll need:

  • Gripset Betta Concrete Crack Filler
  • Clean cloth
  • Screwdriver or similar
  • Blower, vacuum or air compressor
  • Foam backing rod (depending on the depth of your crack)
  • Masonry trowel



Step 1: Choose your surface

Before using Gripset Betta Concrete Crack Filler to repair your concrete cracks yourself, you need to first ensure the surface is suitable for the product.

Uses and surfaces include:

  • Sealing cracks on concrete pavements
  • Sealing saw-cut concrete joints
  • Filling and sealing control joints
  • Sealing between concrete pavements and utilities
  • Sealing around poles, posts and other penetrations in concrete surfaces

How big is your surface? It is not recommended to fill cracks that are wider than 15mm wide.


Step 2: Prepare your surface

Before you begin filling the concrete cracks, it’s important to ensure your surface is adequately prepared.

You can prepare your surface as follows:

  • Ensure your surface is sound and stable – If concrete is loose or unstable, repairs should be made before crack sealing commences.
  • Clean both the surface and within the crack to ensure it’s as clean as possible – Surfaces must be free from moss, grime, oils, petrol/diesel residues, animal fats and grease.
  • Use a tool such as a screwdriver to help you loosen up inside the crack to help get rid of any excess debris or dirt.
  • Use a blower, vacuum or air compressor to remove dust and loose matter in cracks and joints.


Step 3: Cover your cracks

Once your surface is prepared, it’s time to start using the concrete crack filler to fill in the cracks. As a guide, 1 litre of Concrete Crack Filler will seal cracks 3mm wide and 5mm depth, by 5mm length.

Concrete joints with a depth greater than 40mm will require a foam backing rod to be placed inside the joint before filling.

  • Cut the tip of the lid of your liquid crack filler and begin to squeeze and apply it to the crack, moving across the crack as you go.
  • Make sure you apply enough so that you slightly overfill the crack to allow for some settling.
  • If you like, you can use a masonry trowel to help smooth it out once you’re finished.


Step 4: Let it dry

Now it’s time to let the crack filler dry.

How long does it take?

In warm conditions of 20 °C or higher, the Concrete Crack Filler will be dry within 15 minutes and ready for traffic after 1 hour. In cooler conditions, drying may be prolonged.


Concrete is prone to cracks, but with this simple and easy guide using Gripset Betta Concrete Crack Filler, you will be filling your concrete cracks in no time.

Bondall has been leading the building industry for over 50 years. With products that are environmentally and user-friendly we’re focused on extending the life of your finished projects and building materials.

For more information on the Bondall products or repairing concrete cracks, contact us today.