Using a power drill and paddle attachment mechanizes the job of stirring paint, but it can cause splatters. One way to solve the problem is to use a paper plate. Punch a hole in the center of the plate and push the end of the paddle attachment through the hole before chucking it into your drill. Then hold the plate down over the open can while stirring.
Never store paint where it will be subjected to subfreezing cold or extreme heat (over 100 F/ 37.78 C). Although most paints are formulated to withstand several freeze-thaw cycles, these conditions can ruin coatings by causing then to solidify.
It is always a temptation to take short cuts. You may choose to paint over wallpaper either because you don't want to take the time to remove it, or perhaps the paper hides cracks and defects in the walls of your older home. Most professionals will suggest that you remove the paper because it may peel or the wall covering texture will be difficult to paint over.
Use the right solvent to clean up paint equipment. Check the paint can label. Generally use a mild detergent solution for water-based paints, mineral spirits for alkyd enamels, mineral spirits or turpentine for oil paints, alcohol for shellac, and mineral spirits for varnish. When you are reusing solvent for cleaning equipment, occasionally rub some between your fingers. When it begins to feel sticky, dispose of properly.
Always store paint in its original container, with the label intact. This will help you properly identify rise color and type of paint when you go to use it again. If key information is concealed by paint drippings, write down the brand, manufacturer’s code, color, gloss level and type of paint on a strip of masking tape and affix it to the side of the can before you put it away.
Like tile, most paint will differ slightly in each lot produced. If you plan to use the same color thoughout your house, it's a good idea to purchase as much paint as you can at one time. This will avoid any deviations in the paint color and save you an extra trip to the store.
When using latex be sure that the temperature is above 50 degrees F. It is difficult for latex to form a film at lower temperatures. With solvent-borne paint, be sure the temperature is at least 5 degrees above the dew point. If it isn't, water may condense on the surface as it cools while the solvent evaporates, causing an uneven blushing effect.
Even if your paint was mixed at the store, stir it thoroughly before each use. If it sits for a while during painting, it is best to give it a quick stir periodically.
When using a paint pad, apply the paint with long, straight strokes, all in the same direction. Do not pull the pad back over the painted area. Also, be aware that paint pads have a tendency to leave lap marks if you do not feather the paint carefully where one stroke meets another.
To be certain you'll have touch up paint you will want to buy a gallon or so extra and be sure to have the salesperson write down the exact ingredients of the paint you choose. Luckily, there are machines available which can analyze a chip of paint but, there's that old saying about an ounce of prevention...it could save you from buying gallons later.