Primer paints may be oil- or water-based and are used to seal unpainted surfaces to prevent covering coats of paint soaking in. The appropriate type of primer should be used for the surface being painted - wood, metal, plaster or tiles. There are some 'all purpose primers' available which are designed for two or more of these surfaces.
Paints in powdered form require the addition of a liquid to prepare them for use. The manufacturer's directions as to the amount of oil, varnish, water, or other vehicle required should be followed.
The paints may be applied by brush or spray; the small spray attachment for vacuum cleaners is very convenient, especially for painting radiators.
Like this, it will actually take quite a while to reach a number that is close enough to the yellow color you've chosen that you can't tell any difference (and mathematically, you will never actually reach an average of 4!)
Inside the house is where acrylic shines. It dries faster than other types, and it keeps its color better, without yellowing. One disadvantage: It costs more.
Before you start painting, it is a good idea to keep an eye on the weather for rain or snow. You don't want to start painting only to stop abruptly because of the weather.
Our next step is mixing the oil paint. DO NOT SKIP THIS STEP. Obviously you will need to buy some paint thinner, but the most important product you will need is Penetrol $12. Take a plastic quart cup that you will be painting out of and fill it up about three quarters with paint. Now mix in a couple of tablespoons of Penetrol and the slightest amount of thinner. Mix it up with a stick real good and you are ready to go. Why Penetrol? This product is the key to a fantastic looking job. Penetrol will not only smooth out the finish it will extend the time (usually about 20 minutes) before the paint starts to get sticky. This will allow you to apply a glass like finish and eliminate brush marks. We are going to apply two coats here as well so don't glob on the paint. When you are painting the door frames get used to the paint and watch your drips. After about ten minutes or so you will get used to how the paint flows and how damn good your finish looks. Allow to dry overnight before apply second coat. Tip: after you apply the second coat remove the tape and don't allow to dry first. You will get a little paint on your hands from the tape, but deal with it. By removing the tape now you will ensure crisp lines. In some case when you allow the second coat to dry you will pull a bit of the oil paint off. It is not common, but in my opinion why take the chance.