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How to paint over powder-coated metal

2012-02-04   Views:30

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Powder coating is different from conventional liquid paint, because it doesn't need solvent to prevent the binders and fillers from solidifying. Applied electrostatically, powder coatings form a painted skin much thicker than ordinary liquid paints.

How to paint over powder-coated metal

Powder coating is different from conventional liquid paint, because it doesn't need solvent to prevent the binders and fillers from solidifying. Applied electrostatically, powder coatings form a painted skin much thicker than ordinary liquid paints. Powder coating also tends to dry flawlessly and produces much less hazardous waste than liquid finishes. Unfortunately, powder coatings aren't compatible with water-based paints. If you'd like to paint over powder-coated metal, choose the correct type of finish, or adhesion problems will prove inevitable.

Things you need

220-grit sandpaperPressure washerTack clothsProfessional masking tapeCanvas dust sheetsSolvent-based paintRoller frameNap roller coverChina paintbrushWhite spirit

Instructions

1 Sand the powder-coated metal lightly with 220-grit sandpaper. Don't strip the coating off; the goal here is to slightly roughen the metal coating to make sure the new paint sticks to it.

2 Wipe down powder-coated metal furniture with tack cloths. Rinse exterior powder-coated metal cladding with a pressure washer. Let the metal dry for two hours.

3 Coat powder-coated metal with a solvent-based paint, using a roller. Roll vertically, stopping every few feet to scan for runs. Smooth any runs with a china brush. If you are painting powder-coated metal furniture, bypass the roller in favour of a china brush. Your own personal brushing method will work fine, as long as you apply a light coat and smooth runs before they have a chance to dry.

4 Let the powder-coated metal dry for two hours. Add a second coat.

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