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09 June 2011

General Processes - Spray Painting on Wood Surface

General Processes

Pre-Check
  • Check if your workpiece is best painted before or after jointing. If you get that wrong, the process of spray painting for the subsequent layers will become a nightmare.
  • Ensure that the surfaces for spray painting is well finished (sanding), dry and and cleaned of wood dust.
  • Note surfaces or edges that will be covered or out of sight, you need not spray paint those areas.
  • If you have to drill holes or cut a rebate joint somewhere in your workpiece, get it done before spray painting.
Step 1: Part 1 of 2 Preparation for Location and Supports
  • Locate a well-ventilated designated area suitable for spray painting.
  • Prepare a few waste blocks of wood to support and elevate your project. A turntable will be perfect.
  • The turntable or the blocks of wood will also enable you to turn your project around during spray painting without touching your project.
Step 2: Part 2 of 2 Preparation for Spray Can

  • Shake the can for two full minutes once you hear the mixing ball begin to rattle.
  • Before you start spaying on your workpiece, it is a good practice to spray first on a piece of scrap material. to make sure the paint is coming out in the way it is meant to.
Step 3: Spray Painting

  • Maintaing a distance of about 300mm from the spray nozzle to the project.
  • Select a starting point on one end and spraying across your project in one sweeping motion.
  • Do not hold down the spray button continuously, when you are at the end of the first pass release the spray button.
  • Always be mindful and maintain a constant distance from the item being painted.
  • Overlap each pass by about a third to keep paint finish even and consistent.
  • Continue in this fashion until entire project has one coat of paint.
  • Allow paint to dry for the recommended amount of time before adding a second coat.
Repeat Step 3 if necessary.

Tips:
Apply each coat of paint in thin coats to avoid runs or drips.

Note:
Unlike lacquring on on wood, there is usually no need to sand the surface before applying the next coat.

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