Watco Basics Acid Etcher


We no longer stock this product; please contact our technical team on 0113 2455450 (option 2) or send a message to [email protected] where we will be happy to find an alternative product.

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If you are painting a bare concrete floor, it is essential that the surface is prepared to prevent the paint peeling. New concrete often has a weak dusty layer of cement deposits which would have risen to the surface as the concrete dried. Old bare concrete will have loose cement and grit embedded in the surface. Etching the floor addresses both these problems. If it is not done, the paint will just stick to the loose surface material and will break away with the weak deposits on the underside of the paint as the floor is put into use.

Most paints rely on a degree of penetration into bare concrete and etching will help open up hard, smooth concrete (not power floated, please see Watco Powerfloat Primer), to allow the paint to penetrate and key. Dirt, dust and light oil is also removed by etching. Following etching the concrete will be ‘brighter and whiter’ and look like it is ready for painting.

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Features & Benefits

  • Suitable for new or old bare concrete, interior and exterior
  • Etches smooth, bare concrete to provide a key for floor paint
  • Removes dirt, loose grit and light oil deposits
  • Removes weak cement particles from the surface of new concrete
  • Reduces alkalinity in new concrete


  • Remove any heavy oil and grease using Watco Basics Floor Cleaner
  • The concrete floor should be dry before using the Acid Etcher


  • Scrub with a stiff broom. The Acid Etcher will froth as it reacts with the alkaline concrete
  • When the frothing stops it means the Acid Etcher has done its job. It will have loosened the weak surface material. This will need washing off
  • Use clean water and a broom to wash the reacted Acid Etcher away. The acid will be neutralised by now and will not be harmful
  • Allow the floor to dry. It is then ready for painting

Product Details

Data sheet

For Use By
General Use
For Use On
Concrete Floors
Application Method
Single, Two or Three Pack
Single Pack
Pack Size
5L will cover approximately 20m2 depending upon the texture and porosity of the concrete.
Shelf Life (from date of manufacture)
24 months in unopened containers.
Base Type
Exterior / Interior Use
Exterior & Interior Use
Suitable For Use On
Concrete Floors
Application Method
Product Type
Acid Etch

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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Watco Basics Acid Etcher is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

All delivery costs below are excluding VAT

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*All estimates are based on theoretical consumption rates for a single coat and do not take into account any substrate deviations or wastage


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Watco Powerfloat Primer

An epoxy resin primer that allows smooth concrete to be painted without mechanical preparation. For priming power floated, very smooth or non-porous concrete floors which are prone to rejecting paint. Ready for overcoating in 12 hours Rapid version available, ready for overcoating in 4-6 hours Unique formula prevents paint peeling...

Price £116.74 (ex. VAT)
In Stock and Available for Delivery