Surface Preparation: One of the most important things to take care is preparing the surface before painting on. You must prime new surface to seal of the wood and to provide a perfect bonding surface for your paint other wise wood tannins could bleed through paint. Further more moisture from the wood could reduce the adhesiveness of paint. Take care, previously painted surface too can have cracks and peeling paint, this could weaken your paint. Such surface should be scraped with a scrapper or by a wired brush. To get better result sand the surface after scraping the peeling paint. It’s a good idea to use primer in areas you have scraped to bare wood.
Quality of Paint: The factor that determines how long you painting lasts is the quality of paint that you use. Not necessarily you go for the costliest paint but make sure it is not of a low quality.
Extreme weather: Applying paint in temperature above 90 degree F or below 50 degree F is not advisable. As high temperature makes the paint dry very fast, it can’t stick perfectly to the surface. And when below 50 degree F the moisture in the air increases which makes your paint weak as paint needs some time before it can get wet. It’s better to contact some commercial painters in Melbourne who can guide you better.