WATER-BASED PAINTS OR OIL-BASED PAINTS
The majority of wall paint sold today is water-based, primarily because of its ease of use. If your surface has been previously coated with an oil-based product, be cautious when switching to water-based paint as it may have trouble sticking. In this situation, Sherwin-Williams recommends washing the surface and then roughening it all over with a medium to smooth grit sandpaper—making it clean, dry, and dull in order to prevent peeling of the new coat.
For those instances when an oil-based paint would traditionally be preferable, but you desire a water-based product, a number of companies have introduced “waterborne enamels” or “waterborne alkyds.” These paints look and behave much like oil-based options because they have good leveling qualities for a smooth finish.
Advantages of water-based paints
doesn’t require a pre-treatment
no mildew growth
low VOCs (low levels of toxic emissions)
easy cleanup with water
an elastic, flexible finish resistant to cracking
can be used on almost all surfaces
stable color over time, doesn’t yellow or fade in sunlight
Disadvantages of water-based paints
don’t tend to be as vivid or rich
aren’t as long-wearing as oil or urethane-based paints
can delaminate from walls if dampened
Oil-based paint can be used on almost all surfaces, and is praised for its high durability and rich finish. Still, be cautious, as oil paint emits strong fumes that can be overwhelming, and the paint cannot be washed with water. If you choose oil paint, solvents like turpentine are necessary for washing brushes or other materials with unwanted paint on them.
Advantages of oil-based paints
good for high-moisture rooms (ex. bathroom or kitchen)
longer dry time (good for making fixes)
good “leveling” (brush strokes fill themselves in to create a smooth finish)
hard, durable finish
Disadvantages of oil-based paints สถาปนิก