Due to EU legislation, oiled based paints have changed. What that mean in a nutshell for customers is a yellowing effect regarding whites. This occurs after a few weeks once the paint has dried. The yellow is slow and in most cases unnoticeable but in others it is obvious.
Water based gloss and eggshell can offer a longer lasting white but overall, it's finish is not as easy to achieve as it was with solvent based paints. It takes an extra two coats on average to get a decent finish and still it does not compare to solvent based paint.
The solution, well I suggest spending money on a very good brush as cheaper brushes tend to drag and leave your finish streaky. If you are after that flat, smooth finish accustomed to solvent based paints, you will need a set of very good brushes. You will also need to apply a water based undercoat.
On application it really helps to damp the area with a cloth and make sure your brush is damp prior to dipping. After each coat, it is extremely important to sand each coat once it has dried. The benefits out way the efforts involved if you desire the best finish.
Still the finish is not as good as solvent based paints and if, as a customer you prefer water based, then you have to understand that it will take twice as long to administer to a surface.
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