Primer & Undercoat

Shop our extensive range of primers and undercoats from biggest and best trade paint brands. With options from Dulux Trade, Crown Trade, Johnstone’s, Zinsser and more, you are sure to find exactly what you need. Primers and undercoats are a vital step in the painting process, that is often overlooked. Without the right paint primer and undercoat, you risk peeling and discolouration. While the terms ‘primer’ and ‘undercoat’ are often used interchangeably, in basic terms an undercoat is always a primer, but a primer is not always an undercoat. 

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  1. Johnstones Aqua Undercoat Dark Grey
    From £18.91 £15.76
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  2. Johnstones Aqua Undercoat Tinted Colours
    From £20.64 £17.20
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  3. Blockade primer
    From £19.74 £16.45
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  4. Sandtex Flexible Primer Undercoat Gray
    From £14.82 £12.35
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  5. Dulux Exterior Preservative Primer BP
    From £44.29 £36.91
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  6. Dulux Weathershield Exterior Undercoat Colours
    From £54.44 £45.37
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  7. Stormshield Flexible Undercoat (all colours) 2.5L
    From £57.16 £47.63
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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. Undercoats serve to create a smooth, uniform and even surface for topcoats, while primers act as a base for your paint to latch on to.

A Guide to Primers & Undercoats

One rule to abide by when it comes to paint primer and undercoat paint is; if a surface is new, use a primer. If it’s an existing pre-painted surface, use an undercoat.

Undercoats

Undercoats An undercoat is used to provide a neutral foundation for colour to develop. This is because they work to cover surface imperfections, therefore they are often sanded before recoating.

Typically used on wood surfaces, undercoats are best used with enamel topcoats to form a substantial, denser look. Trade undercoat paints are applied over a sealer or primer to reinforce and strengthen its function. It creates a tough, resistant barrier to moisture and creates a perfect base for further product.

Primers

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.

Primers typically bond best to matt or low-gloss surfaces, and each primer is formulated to the specific requirements of our surface.They are different categories of primers depending on your needs, bonding primers are perfect for more difficult, tricky surfaces while sealers are capable of managing stains in a single coat. Always ensure your purchase one that is compatible with your chosen surface, we have a large selection to choose from including interior and exterior walls, interior and exterior wood and metal.

Primers & Undercoats at The Paint Shed

Whatever your desired look or feel, the use of primers and undercoats only serve to better your painting project. Using them never hurts but disregarding them can be a disaster, which is why for optimum adhesion we advise opting for them when required. High quality all-in-one primers, sealers make it even easier for you to achieve the perfect finish. Shop a range of sizes, colours and finishes suitable for all paint projects. Whatever your requirements The Paint Shed has the perfect trade undercoat and primer paint for you.