You scuff up existing paint for two reasons. First, you want to get rid of any oil, grease or dirt trapped in the top layer of paint. This is the stuff that cleaners and degreasers can't get off. The second reason to scuff is to set up a physical bond for the new primer and paint to adhere to. You want to give the old paint some tooth so the new sticks better.
THE BRUSHWORK. Depending on the art movement and personal peculiarities of the artist, the brushwork can range from delicate and almost invisible to rough and plastic.
You can put it around a room and probably follow immediately with the finish coat. It can be applied with brush or roller.
STIPPLING. Whether you desire the effect of stippling (tiny paint dots) as a decorative effect, or if you have a wall which has an uneven surface and you feel you can hide the defect by stippling it, you may accomplish this result very simply.
Following a European directive, the British paint industry has reduced VOCs in two stages, the second of which came into force in January last year.
Use Tinted Primer for Dark Paint Colors.In our second case, suppose you want to apply a deep, dark blue to a beige wall. The good news is that it will be easier to darken a light color than it was to lighten a dark color. In fact, it may only take 2 - 4 coats to get total color coverage in this scenario. The bad news is that if you start out with a white primer you are already moving in the wrong direction. Doing so could increase the number of paint coats you need to 3 - 6... plus the coat of primer! That's a lot of painting!
If you have large holes or cracks in a wall purchase a small can of vinyl repair paste. The reason I prefer it over regular wall Spackle is that after it dries it is much harder and sands easily. You can even use it for minor wood repair in a pinch.