Undercoat

An undercoat’s key purpose is to provide a smooth, uniform, even surface for topcoats. They are particularly useful with enamel topcoats, because they supplement topcoat film thickness and help impart a more substantial, denser finished look.

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    Johnstones Aqua Undercoat Tinted Colours
    From £19.66 £16.38
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    Aqua Undercoat Dark Grey
    From £18.01 £15.01
  3. Johnstones Flexible Undercoat Grey 2.5L
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    Johnstones Flexible Undercoat Grey 2.5L
    £56.62 £47.18
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    Dulux Undercoat (White)
    From £21.92 £18.27
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    Johnstone's Joncryl Water Based Primer Undercoat White
    From £12.83 £10.69
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    Armstead Quick Dry Wood Primer Undercoat
    From £9.24 £7.70
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    Crown Trade Full Undercoat (White)
    From £19.51 £16.26
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    Teamac Marine Undercoat
    From £20.58 £17.15
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    Sandtex Flexible Primer Undercoat White
    From £14.14 £11.78
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    Farrow & Ball 750ml Exterior Wood Primer & Undercoat
    From £21.49 £17.91
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    Crown Trade Fastflow Quick Dry Primer Undercoat White
    From £10.16 £8.47
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    Dulux Undercoat (Pure Brilliant White)
    From £24.12 £20.10
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    Johnstones Professional Undercoat White
    From £9.98 £8.32
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    Leyland Acrylic Primer Undercoat White 5L
    £24.06 £20.05
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    Armstead Undercoat Dark Grey
    From £9.01 £7.51
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    Farrow & Ball 750ml Interior Wood Primer & UnderCoat
    From £20.50 £17.08

Items 1-16 of 41

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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.