How to Paint Galvanized Corrugated Roof Panels

Written by ryan lawrence
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How to Paint Galvanized Corrugated Roof Panels
Galvanised panels are coated with a layer of zinc that protects them from rust. (Photos.com/Photos.com/Getty Images)

If you are planning to paint galvanised corrugated roof panels, consider a pair of important points before you begin the application process. Galvanised panels are coated with zinc. This coating protects them from rust. Unfortunately, it also makes them ill-suited for paint adhesion. You must condition the roof panels to accept paint by applying a special acidic primer, capable of etching galvanised metal. You should also select a particular paint, formulated to expand and contract as temperatures fluctuate, or the finish may ultimately fail.

Skill level:
Moderate

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Things you need

  • Ladder
  • Pressure washer
  • Low-pressure tip
  • Heavy-duty fabric dust sheets
  • Roller frame
  • 2 nap roller covers
  • Galvanised metal etching primer
  • 3- to 4-inch latex paintbrush
  • Acrylic latex paint
  • Roller extension pole

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Instructions

  1. 1

    Use a ladder to access the corrugated roof panels.

  2. 2

    Wash the corrugated roof panels, using a pressure washer equipped with a low-pressure tip. Wait approximately 2 to 3 hours for the panels to dry.

  3. 3

    Protect areas beneath the roof panels with dust sheets.

  4. 4

    Coat the clean corrugated roof panels with galvanised metal etching primer using a roller stocked with a nap cover. Use a 3- to 4-inch paintbrush to smooth the primer within the inundated areas of the corrugated panels. Wait 4 hours for the etching primer to dry.

  5. 5

    Wash each of your painting tools with tap water.

  6. 6

    Coat the primed corrugated roof panels with acrylic latex paint using the roller stocked with a new, fresh nap cover. Use the clean paintbrush to smooth the paint within the inundated areas. Use a roller extension pole if needed. Wait 4 hours for the paint to dry.

Tips and warnings

  • Add a second coat of paint if the primer bleeds through.
  • Never paint unprimed corrugated roof panels or the paint will peel.
  • Don't use plain acrylic, latex or oil primer on a corrugated roof panels or the finish will eventually flake.
  • Read the safety guide on the side of the ladder before you begin work.

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