Have you painted a wall yourself before. Yes, all scratches and gabs are not visible. No, You think that this scratch will be invisible. Your wrong. You will see it all. Good and fast preparation and quality after painting depend from your experience. Courses can help you of course. But any way you need to have experience. Driving licence you can get after some ours learning, but when you became a good driver.Directly after passing exam, one year driving, two years may be. No when you drive at least 300 000 miles or even more.
Have you chose the right paint brush for your painting. This is very important to chose the right one. How to chose the right paint brush. Quality of painting depend on paints, surface, and painter experience. If you chose to small or to big paint brush and not the right type then you will spend a lot of time to paint a wall or door and on the surface will appear streaks of old colour.
Chemistry, not right painting chemistry will cause you only big problem. You need to do emergency call. varnish, staining, oil paints, water based paints. Not every time you can paint covering another different paints. For your DIY work is better to use exactly the same type of paint. Solvents: paints are mostly ready for painting but not all surface. Sometimes is necessary to use solvent.
Before preparing walls it's important to remove damp and mould.Prevent to keep them out.
Preparation time can take 70% or even more of all time working. Quality of preparation will be visible after painting. On relatively good walls condition you can spare much working time.
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