Do You Need To Undercoat A Painted Door. undercoat paint is similar to primer but with one key difference: when any primer has dried, rub the door down with fine sandpaper and then a clean cloth to remove any dust.
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This is because they work to cover surface imperfections, therefore they are often sanded before recoating. If applying a layer of undercoat, it should preferably be by the same. It contains more colour pigment and fewer binders.
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Particularly dark or bright colours at times require a grey undercoat; an undercoat is used to create a neutral base for colour to develop. you need an undercoat for gloss paint if there is a strong colour change, if the surface is bare (in addition to a primer), or the paint underneath is in bad condition. undercoat paint is similar to primer but with one key difference:
