While factory pre-painted architectural panels last many years longer than regular painted panels, they still require thorough cleaning. If there is automatic washing of rainwater, such as roof slabs, no maintenance is required. Cleaning can remove accumulated corrosion and keep the building looking good without the need for painting. Places that need to be cleaned include brackets, side panels under drip eaves, warehouse door panels, grooves on the back of drip eaves, etc.
(1) Cleaning: Usually, most of the dust and residue accumulated on the surface of the steel plate can be removed with clean water. In theory, cleaning should be done at least every six months. More frequent cleaning should be done in coastal areas with more salt spray and in places with more industrial dust. For stubborn stains that cannot be washed off, use a weak detergent or household ammonia. In any case, before cleaning a large area, scrub in inconspicuous small pieces. Take a scoop of laundry detergent (or other detergent with less than 0.5% phosphate) and dissolve it in 5 gallons of hot water; or dissolve a cup of household ammonia in 5 gallons of room temperature water. Do not mix ammonia with any bleach; do not mix detergent and bleach without permission. If cleaning and bleaching is required, use a detergent that contains bleach. Using any of the above cleaners, clean the steel surface from top to bottom with a soft soaked cloth, sponge, soft brush or low pressure nozzle to avoid streaks and bright spots. Stain removal powders or industrial detergents are not recommended as they can damage the paint. Water-soluble detergents are effective and can be used. If fungus and mold cannot be removed by the above methods, a detergent containing bleach is recommended. After cleaning, the surface of the steel plate should be completely free of cleaning agent residues.
(2) Repainting: If scratches appear during installation and use, it may be necessary to repaint the defective parts. Improper or excessive patching can damage the entire surface. Scratches that are not apparent at 6 feet should not be repaired, as they may be covered by normal wind erosion. Only the peeling parts of the paint need to be repaired for paint repairs. Dirt, paraffin, and other grime will need to be removed with alcohol from the parts to be repaired prior to paint repairs. Touch-up paint is not recommended for repairing large areas, as touch-up paint does not air dry as well as factory pre-painted. Consult the building panel manufacturer or coating supplier for a suitable gunning system. Aerosol or spray repairs are not recommended for scratch defects. A better repair tool is a high-quality, 1/2-inch or smaller paint brush. If maintained as described above, color coated boards will retain their original color for a long time.
Hungthai Metal is a professional steel manufacturer and exporter. Color coated steel coil is also called prepainted galvanized steel coil, PPGI, PPGL in China, as a PPGI and PPGL manufacturer and exporter in China, we use our own high-quality galvanized steel coil and galvalume steel coil to produce color coated steel coil.