Primers & undercoats
A paint primer is the first coat of paint you will need to put on metal, wood such as MDF, and walls if the surface has never been painted before. By adding a primer, it creates a better bond when you paint the surface with your topcoat, giving a more hard-wearing finish. If you paint a new surface without primer, you may find that you will need more paint as the surface will soak up the paint. Some paints include a 2-in-1 paint and primer, so it's worth checking before you buy. You would more likely use an undercoat on a surface which has already been painted before, as it will still give a smoother finish by adding before applying the topcoat. You may also want to consider if the undercoat is for indoor or outdoor use, if you are looking for cover up odours and stains, and whether you need a water or oil-based primer. Water-based primers are typically better for blocking stains and for use on drywall and bare wood. Oil-based primers are better for surfaces that are used often such as doors.
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