1. Check for weather
Plan is the key, Plan ahead. You must select a dry time of year with little rain and lower humidity. Check for the weather, If there is a heavy rain or several days of rain forecast in the next few days, you will need about six hours of good sun to dry the paint thoroughly enough to not be affected. Oil base takes longer to dry and therefore rain should not be in the forecast for about 24 hours. Ideally latex paints can be applied when temperatures are between 50°- 85° please remember the surface must be dry before painting.
2. Pressure wash /Power wash
Paint won’t adhere to dirty or rough surfaces, so be sure to clean the siding and trim thoroughly. Use a cleaning solution and depending on the type of siding Wood/Stucco/Vinyl, you should use recommended low pressure setting only, 25-40 degree nozzle tip and keeping a minimum of 18 inches from the surface to avoid driving water beneath or behind the siding.
If the dirt is intensive throughout the home sidings, then power wash is recommended.[Note : Power wash and pressure wash are not the same ] A power wash machine uses a high-pressure stream of very hot water to blast away dirt and materials from outdoor surface.
[CAUTION: When using your pressure washer, never point the gun at any person or pet , Never allow children to play around a pressure washer when it is in use , Improper handling of pressure washing system may cause severe damage-Read the safety instructions from manufacturer]
3. Peeling paint ,Rotten wood
Allow sufficient dry time, usually 3-4 days .Paint won’t stick over peeling paints and rotten wood. Scrape all the peeling and loose paints, Replace the rotten wood with new material or you may use wood filler if in case of smaller area.
4. Don’t forget to Sand and caulk
Sand the filled areas and scraped areas to create a smooth transition between old paint and bar substrate. Caulk the window/door/trims joints and gaps using a paintable latex caulk with exterior grade.
5. Use Primer
Some who are painting for first time may be tempted to slap paint on the bare (wood/metal) substrates. As a thumb rule, apply primer on bare substrates.
6. Apply the Paint
Remember to start applying paint beginning from one corner to the other ,do not be tempted to begin from centre or random location .Use a lint free microfiber roller for better results. Read the paint manufacturer instruction for Re-coat application time for second coat.