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.
One precaution: You can't paint with it in cold weather. The chemical reaction that transforms the water solution into a durable finish will not take place if the temperature is below 50°. (Conventional oil paints don't stick well in cold weather, either.)
Fine motor: Beginning to learn to use a pencil before you have developed finger and thumb strength and stability results in a child developing an inefficient pencil grip. When a child has weak thumb stabilisers, he is likely to wrap his thumb around his index finger to try to create greater stability. This makes it very difficult for him to then develop the necessary finger isolation (separate movement of the fingers to give easy, dextrous pencil control). Children who have not yet developed their wrist stability will try to use whole-arm movements to do their drawings and writing and will press very hard. If a child has not developed the bilateral integration (this happens in the brain and is the smooth, efficient communication of the right side of the brain with the left) cutting will be difficult and he will have difficulty writing across his page and reading across a page or school board. Beginning to use a pencil too soon therefore inhibits learning in a formal class setting, rather than helping it.
Gloss - These paints have a high sheen level and are usually used on woodwork.
To balance, you must grasp the interconnectedness of color schemes. All these interactions are defined in the color wheel, and it has been used to build color schemes for centuries.
Mixing. Paste paints, such as aluminum, resin-emulsion, and lead-in-oil, should be stirred with a stiff paddle and reduced to painting consistency with the liquids recommended on the manufacturer's labels.
A flat, semi-gloss, or high-gloss finish may be applied to the primed surface. For a flat finish, two coats of flat wall paint should follow the priming coat. For a semi-gloss finish, one coat of flat wall paint and one coat of semi-gloss paint should be applied to the primed surface. For a high-gloss finish, one coat of semi-gloss paint and one coat of high-gloss enamel should be used over the priming coat.