Exterior Paint Tips:
Always read the paint can label! Pay special attention to what primers are compatible with your paint and how long before you can safely put on a second coat. The label will always say to appy the paint to a clean, dry surface and theres a good reason for it. Paint is basically colored glue. Don't rely solely on a power washer to clean your surfaces as it will still leave behind a residue, you should always run a brush with soapy water to remove all dirt. If your working on your house siding, a broom would work well.
Using a water sprayer can inject water in behind your siding, you should allow several days drying time, or less if your weather is hot. Leaving the liquid in there can cause blisters or bubbles to form and you will find yourself painting your exterior again in the near future. If you find any cracks, its a good idea to use a water based, paintable caulking to seal it. The caulking will leave a nice looking finish and is worth the extra effort.
Be careful scraping or removing any paint from a house built before 1989 as basically all the paint was lead based back then, and you really dont want to be inhaling that toxic stuff.
The environmental protection agency has some useful infomation on lead paint and safe removal: http://www.epa.gov/lead/
Try not to paint in direct sunlight or on windy days if you can, this will cause your paint to "Freeze" right away and not only will it leave brush or roller marks it may also hinder the natural curing process and weaken the paint.
Interior Painting Tips:
Read above, as most of the information for exterior paint still applies to interior jobs. Preparing your area is a little different as you dont really want to use a pressure washer in the house. TSP (Trisodium phosphate) is a good product to use on your existing painted walls as it cleans it very well and seems to open up the pores to allow for better bonding.
If you find a hole simply fill it with some drywall compound. If your in a hurry and want a better harder plaster surface, mix up some sheetrock 90 to fill the holes. Keep in mind that sheetrock 90 (or other variants like sheetrock 45) will dry into a harder plaster and will be more difficult to sand.
I will discuss rolling tecniques, the best way to roll a wall is in long strokes. Dip your paint, spread it in a V or W shape in the middle and then start rolling to the top as far as you can go without touching the ceiling all the way to the bottom. Every roller dip should cover about 1.5 to 2 roller widths on the wall. Never go back and touch up a spot you think you missed as that will surely leave a worse and more noticeable mark.
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