Primers & Undercoats Paint How to Guides Farrow & Ball

That’s usually where patchy coverage, flashing on woodwork, or peeling around repairs starts. Below is a table which compares the main differences between primer and undercoat paints. Understanding when to use a primer or undercoat for wood is essential for preventing issues like peeling or discolouration. Knowing when to use a primer or undercoat for walls can save you from common pitfalls like uneven coverage or peeling paint.

Available in a wide range of colours for high coverage, opaque look to your garden surfaces. For bare wood, we recommend using a colourless priming oil. This product can work as a primer or undercoat for new or previously painted surfaces including glass, tiles, PVC-plastic, wood, chipboard, and more.

If the surface is mostly bare wood or board, look for a product designed specifically for that material. Even the right primer and undercoat can disappoint if the application is sloppy. A good starting point is this guide on how to prep wood for painting, especially if your job includes old gloss, filler, knots, or bare sections. This thinned layer penetrates deep into the professionele schildersbenodigdheden online pores of the plaster.

Key differences at a glance

No, undercoats are not designed to seal surfaces. An undercoat ensures smoothness and colour uniformity. Skipping primers or undercoats often leads to more layers of topcoat being needed, increasing the overall cost of the project. This prevents peeling and increases the lifespan of the paintwork.

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A prepcoat is any coat of paint applied to your substrate to prepare for the application of the topcoat. It can be pretty confusing when these terms start getting thrown around when talking about DIY projects. Suitable for both interior and exterior bare or previously painted wood, including floorboards and knots. No, you cannot use a primer as a top coat, as it isn’t designed to function as a finish. This is because primer acts as an adhesive and can prevent the topcoat from peeling off later.

Interior Applications

Undercoats are simply a prepping layer without properties to protect the surface or improve adhesion. For any painting project to have a professional-quality finish, applying undercoat paint is an essential step. Observe the application and drying time recommendations provided by the manufacturer. Apply the undercoat in thin, uniform layers for optimal results.

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What Are Primers and Undercoats?

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• For bare wood, we recommend using a colourless priming oil.
• Primers contain resins that allow them to provide a chemical bond between the surface material and the paint.
• If you are making a drastic colour change, for example from a dark to a light colour, the primer has properties that will help mask the colour beneath before applying the topcoat.

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• Their paint and decorating range is backed by practical hardware knowledge, which makes a difference when you’re matching products to real jobs rather than guessing from the shelf.

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• If you ignore that and treat every primer or undercoat the same, you’ll get caught out.

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• Oil-based primers are very versatile because they work well with both latex and oil paints and can be applied to a large number of different surfaces.

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• A lot of people assume that once primer is on, the surface is safely protected until they get round to the finish coat.

A good painting project requires undercoat paint, sometimes referred to as priming or base coat. Bradley Hamilton is a seasoned painter with over 14 years of experience in the industry. They are weakest on extreme surfaces, such as raw MDF edges, rusty metal, heavy stains or knots, where a dedicated specialist primer still wins. The best coverage and durability come from using each product for its own job. Some tins combine both roles as a “primer undercoat”, but a plain undercoat is not a primer and will not seal bare surfaces properly.

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Because primers are surface-specific, the honest answer to “which do I need” is “it depends what you are painting”. Filling, sanding and cleaning come first every time, and our guide on how to prepare walls for painting walks through the groundwork every base coat depends on. They are not rivals, they are two parts of the same layered system, and on a proper woodwork job you often want both. Going from a dark colour to a pale one, plan on two coats, and consider a grey-tinted undercoat under deep topcoat colours. It is designed to go on after a primer (or over a sound, previously painted surface) and its job is to build. The two words get used interchangeably, and plenty of products now blur the line by calling themselves a “primer undercoat”.