Johnstone's Trade Primer and Undercoat

As Johnstone’s Trade stockists, we offer you a selection of Primers & Undercoats. Whether you need an Ultra Undercoat for a tough job or an efficient Wood Primer, we’ve got them all.

Shop online now for Primers & Undercoats, and should you need some paint to go with that consider other products from the Johnstone’s Trade range, such as Johnstone’s Trade Emulsions, Gloss or Satin products.

At The Paint Shed we are committed to the best prices and customer service, for over 60 years. Shop now and get free delivery on orders over £50. You can also place your order online and pick it up at the store using our Click & Collect service.

13 Items

per page
Set Descending Direction
  1. Aqua Undercoat Dark Grey
    From £18.91 £15.76
  2. Johnstones Aqua Undercoat Tinted Colours
    From £20.64 £17.20
  3. Johnstones Wood Primer White
    From £20.46 £17.05
  4. Johnstones Professional Undercoat White
    From £10.49 £8.74
  5. Johnstones Ultra Undercoat White
    From £26.05 £21.71
  6. Johnstones Aqua Water Based Undercoat White
    From £12.86 £10.72
  7. Johnstones Professional Undercoat (all colours)
    From £14.50 £12.08
  8. Johnstones Universal Primer White
    From £18.85 £15.71
  9. Johnstone's Advanced Stain Block Primer
    From £22.25 £18.54
  10. Johnstones Professional Undercoat (Magnolia)
    From £12.59 £10.49
  11. Johnstone's Joncryl Water Based Primer Undercoat White
    From £13.48 £11.23
  12. Johnstones Ultra Primer Sealer
    From £16.51 £13.76
  13. Johnstones Alkali Resisting Primer
    From £31.84 £26.53

13 Items

per page
Set Descending Direction
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.