With Concrete Etchant you can quickly clean and etch bare concrete floors ready for painting.

  • Removes surface laitance (weak, dusty cement deposits) from bare concrete floors
  • Cleans and removes dirt and unsightly stains from concrete and brickwork
  • Neutralises alkalinity in new concrete floors (at least 28 days old)
  • Using Concrete Etchant means your paint will stay on the floor and not your shoes!

The basics

You’ll need

  • Stiff Broom

This product is available on our website and can be shipped with your order for Concrete Etchant so you can get the job done quickly.

Colour Range

Charcoal, Rustic Brick
While great care is taken with the colour samples shown on the product pages, no guarantee can be given that they represent exactly the colours offered.


Concrete Etchant is supplied in 5 litre containers.

Instructions for use


Concrete Etchant prepares bare concrete before painting to help prevent the paint peeling off. It removes surface laitance (loose cement deposits) and dust and etches smooth surfaces to provide a key. Do not use on painted or sealed surfaces or sand and cement screeds. There’s no need. Concrete Etchant is also really good at removing dirt from concrete. It makes grubby concrete look clean and ready for painting. It doesn’t remove grease or oil, so if you have some of this, you will need our Oil & Grease Remover. Some people use Concrete Etchant to make very smooth, slippery concrete slip resistant. It etches just enough to reduce that slippery feel. It is always best to test a small area first to ensure that the surface is suitable for this treatment.

To see if surface laitance is present, carry out the ‘coin test’. Simply rub the edge of a coin across the bare concrete and if it dusts up then you’ll know you have laitance. But don’t worry, Concrete Etchant will eliminate it and leave a clean, dust free surface that’s ready to paint. Also, it’s a good idea to check how porous the concrete is by doing the ‘water test’. Pour a small amount of water onto the surface to see if it is absorbed or not. If a puddle remains then use Concrete Etchant to etch it. This will help the paint to penetrate and bond.

Prepare It

Simply clean the floor thoroughly to remove traces of grease or oil, leave to dry and then you’re ready to apply Concrete Etchant.

Apply It

Apply the etchant with a stiff broom and leave for about 15 minutes until it stops bubbling. The maximum surface area in which to apply 5 litres of Concrete Etchant is 20m2. To ensure that the etchant is applied evenly we recommend you use a plastic watering can with a rose nozzle.

Use lots of cold, clean water to flush away the etchant, leave to dry and vacuum the area to suck up loose laitance.

We recommend you repeat the ‘coin test’ to see if a further application of Concrete Etchant is necessary.

What else do I need to know?

Store It

The shelf life of Concrete Etchant, if unopened, is one year.

Disposal and Safety information

Always use this product in a well ventilated area and ensure that it does not comes into contact with skin or eyes by wearing suitable protective clothing.

Ensure that objects such as machinery are protected in case of product spillage or corroding fumes.

Please see the Material Safety Data Sheet