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Common interior house painting mistakes
One of the common mistakes that home owners make, when painting the interior of a house without hiring painters, is either paying too much for the paint or too little, and not spending enough money on quality tools (brushes, roller covers etc).

Paint brush
When choosing the brush, don't try to save money here. Cheap brushes are very hard to work with. They don't hold enough paint and it's impossible to paint a straight line with, even if you are a pro. A quality brush price is about $17 for 3 inch brush. “Purdy” is the brand name synonymous with quality brushes.

Roller cover
Quality roller covers are  never sold in packs of 3 or 6. They always comes as a single item at a price of around $10. The best are “sheep skin” or “ lamb skin”. They come in different thickness and the choice will depend on the roughness of the surface you need to paint. Cheap roller covers won't hold enough paint to cover even one line from the top of the ceiling, to the floor of a room 8ft in height. With a quality roller cover, you can paint 2-3 lines before you have to dip your roller in paint again.

Painting process
Another mistake is painting with a roller as a first step of a painting job. First, all painting needs to be done with a brush.
1. Lines between the ceiling and the wall.
2. Around the outlets and window jams.
3. Around the trim of the doors, baseboards and corners of the room.
4. And the last step is to apply paint with a roller on the areas in between.
This sequence will help to avoid lines between the areas painted with a brush and areas painted with a roller.

Paint sheen
Buying a paint that is too glossy. If it is your first painting project, flat paint is the best choice, as it will leave little or no brush marks. Semi-gloss or full gloss requires maintaining a constant “wet edge”. Those two sometimes can be tricky to apply even for a professional painter.

Cutting a straight line
Trying to paint a straight line between the ceiling and the walls using tape. While doing so on the smooth surface may come out ok, most of the drywall is textured. No matter how hard you press the tape against the ceiling, the paint will “bleed” through. That is why all the lines between the ceiling and the walls need to be done by hand without using any tape.

Second coat
Being disappointed after first coat did not come out perfect and thinking something went wrong. First coats are almost never perfect and 95% of all painting jobs will require second coat.

Some of the painting mistakes homeowners make, when painting an exterior of a house by themselves.

Exterior painting of a home is almost never a do it yourself project.
The paint exposed to nature elements (sun, heat) and there is just too many reasons why paint could fail if not applied properly, or surface is not properly prepared.

If a house is not power washed prior to painting or the power washer doesn't have high enough pressure,
usually a power washer with less than 2000 psi (pressure per square inch) will not do a good job in power washing the house. Most gas power washers qualify. Most electric ones have less than 1500psi.

Not scraping loose paint by hand
If the house has a lot of peeling paint, most of it will come off after the house is power washed. But power washing alone will not solve the problem. Scraping loose paint by hand will ensure that all the paint that is about to fall off, will come off before the new paint is applied. Otherwise new paint will fall off with the chunks of an old paint.

Not fixing the cracks
Moisture will get inside the cracks and paint will start peeling.

Not using the right type of paint or primer. Or the right type but of a low quality product
There is a variety of different types of paint for a reason. Not using the proper type of paint manufactured for a particular surface will reduce the life of a painting job significantly.