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.
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!)
Most of us look to save where we can, especially in this day and economic conditions. House painting is no different, when it comes to saving money. A home exterior weathers from harsh elements of heat, cold, sun, and snow, and exterior paint ages over time needing repainting. Exterior trim, being that of solid wood is normally the first to show signs of painting maintenance. Many times a homeowner happens to call, asking for only painting the trim. Trim paint jobs sound good at first, but have some underlying thoughts may have not been considered. Below are things to consider when considering painting trim only.
Amateur house painters never had as much help as today. Scores of new paints and equipment placed on the market in the last few years make it possible for the weekend handyman to paint his own house almost as easily as a professional. From one-coat paints to disposable blowtorches, everything has been designed to make the job go faster, look better and cost less.
And, its never been more important to know your colors. Why? Because color is back in a big way! Just look at the vast variety of colors in the department stores.
Remember this simple rule when thinking about Warm or Cool: Warm individuals have red or gold highlights in their hair. Cool individuals have no red or gold highlights in their hair. That is true for girls and women of all ages. Whether you color your hair, use the color you have now as the basis to determine whether you are Warm or Cool. Congratulations! You are half way towards determining your Season.
Better still, you don't have to spend hours getting ready and hours cleaning up afterward. Premixed paints, electric-drill attachments and self-dispensing calking guns make short work of preparation. Cleaning up is a soap-and-water job for the rubber paints, or a quick dip in special cleaners for the oils. Disposable dropcloths and paper paint pails are used once and thrown away.