First brush with coarse, then with fine sandpaper. To process and apply the different coats the mixtures must be heated. Be careful to keep the temperature under the boiling point. Most paint brands offer different qualities, expensive and less expensive ones. A lot of painters think they have to use the most expensive paint to obtain the best results.
Expensive paint contains a lot of dye and little filler such as chalk, beeswax or cork.
This paint has a strong color power and is only meant to be applied very thinly. For example, in order to glaze or to neutralize strong colors. Some will work with a palette knife and spread the paint too thickly on the canvas. The expensive paint will crack quickly for lack of fillers, bur the cheaper qualities have enough body to keep the applied coat of paint in perfect condition. It is also good to know that the properties of some paints don't allow wrong treatment.