Primer & Undercoat

Preparing your surface before painting is very important in order to get the most of your colour and ensure lasting power. Undercoats and primers although similar serve two quite different functions. While primer acts as a base for your paint to latch on to, an undercoat is used to provide a neutral foundation for colour to develop. If you are questioning the condition of your wall for painting, priming would be your best choice. Priming works to hide stains and prevent discoloration. It is best used on wood or metal surfaces and should always be used when changing from dark to light colours or when transitioning from a glossy base coat.

Always ensure your purchase one that is compatible with your chosen surface, we have a large selection to choose from including…

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  1. Rating:
    Johnstones Ultra Undercoat White
    From £24.80 £20.67
  2. Rating:
    Stormshield Flexible Undercoat (White) 2.5l
    £38.45 £32.04
  3. Rating:
    Stormshield Flexible Undercoat (all colours) 2.5L
    From £54.43 £45.36
  4. Rating:
    Dulux Weathershield Exterior Undercoat Colours
    From £27.22 £22.68
  5. Rating:
    Dulux Exterior Preservative Primer BP
    From £22.14 £18.45
  6. Rating:
    Dulux Weathershield Stablising Primer 5L
    £40.51 £33.76
  7. Rating:
    Sandtex Flexible Primer Undercoat Gray
    From £14.14 £11.78
  8. Rating:
    Macpherson Stabilising Primer Clear 5lt
    £30.28 £25.23
  9. Rating:
    Armstead Stabilising Primer 5L
    £36.00 £30.00
  10. Rating:
    Blockade primer
    From £17.17 £14.31
  11. Rating:
    BIN Primer A/Sol (390ml)
    £13.16 £10.97
  12. Rating:
    Cover Stain Primer Aerosol (390ml)
    £9.16 £7.63
  13. Rating:
    Johnstones Professional Undercoat White
    From £9.98 £8.32
  14. Rating:
    Johnstones Wood Primer White
    From £19.49 £16.24
  15. Rating:
    Armstead Undercoat White
    From £15.48 £12.90

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Not sure which size?

Use our paint calculator to work out how much you need

Enter the dimensions of your walls, details of any gaps like windows and doors, and click calculate

Remember: It's probably better to have a bit too much than to order too little!

Tell us your wall dimensions
Wall 1
How many windows and doors are there in the area you want to paint?

This is based on a coverage of 10m² per litre of paint and one coat of paint.

Make sure you always check the coverage on the product page before purchasing and, if covering a dark or bright colour, you may need two or three coats.