Before you start any paint job, it is crucial to ensure that the work surface is properly prepared to ensure that the paint applies evenly.
There is often a lot of confusion around exactly which product to use when preparing an area – whether a wall, door, radiator etc – as the market currently offers two types of preparation paints:
The one you need will depend on the surface that you have, for example, if you have a door that has been painted in the past, and you are re-painting it, then you should use an undercoat.
An undercoat is better than a primer, for previously painted surfaces, because it contains a pigment that offers better coverage. This will even out the entire surface, so that any darker or patchy areas are not visible through the paint.
Nevertheless, it is important to know that a primer may also be necessary - especially for difficult metals – as a primer will help the paint to stick to the metal.
Using an undercoat can also eradicate the need for a top coat, in cases where one would be needed.