How To Touch Up Galvanized Steel Roof Panel Scratches

Galvanized metal requires either a zinc dust type paint or a latex paint.

How to touch up galvanized steel roof panel scratches.

Let the paint dry for at least 48 hours. Lay down the first roof steel panel squaring it with the mason line. Scratches can easily be fixed with a paint or touch up pen designed to match the color of the roof. While these paint coatings are durable improper handling and installation can mar and damage the finish.

Rub a gentle scrubbing cleanser onto rust spots on metal roofing using a clean cloth. My house was built circa 1880 and still has its original terne metal roof which consists of individual metal shingles with an embossed decorative pattern. Below are steps to prepare the metal before using touch up paint. Install the roofing screws vertically along each rib in the panel.

Secure the screws but do not overtighten. Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run. Galvanized steel on the other hand cannot be painted with an oil based or aluminum based paint. The roof panels are installed similar to the wall panels in layout.

Once the touch up has been applied check for proper inter coat adhesion. Dab a small paintbrush into metal touch up paint and then cover the scratched area with the paint. Cut the first rib off leaving of rib on the first roof sheet of roof steel. All painted metal panels have a factory applied baked on finish.

Place a piece of scotch tape 610 over the touched up scratches and rub your thumb across this a dozen or so times with firm pressure. The washer under the screw head should seal to the surface of the panel without bulging or shifting. Clean the scratched portion of the roof with the mineral spirits and then rinse with clear water and allow it to dry. Touch up and repair with zinc spray metallizing zinc spray metallizing is done by melting zinc powder or zinc wire in a flame or electric arc and projecting the molten zinc droplets by air or gas onto the surface to be coated.

This step is simple. The zinc used is nominally 99 5 pure or better. Touch up paint can cover unwanted scratches chips abrasion marks or other lightly damaged areas on the panel to present a consistent finish and appearance.