With its excellent corrosion and weather resistance, convenient construction method, and attractive appearance, pre-painted steel plates have become the main material for roofing and wall in steel structure buildings. In actual scenarios, regular and proper maintenance is the crucial key for extending the project's lifespan.

QUESTION

01 Why are there mottled rust spots on the new factory building?

02 How to repair the damaged coating in a standard way?

03 How to execute the regular cleaning and maintenance?

PART.01

Clean up the debris instantly to prevent rust buildup.

After a new factory is built, if metal fragments, screws, nails, or other debris remain on the surface of the steel plates, sporadic surface rust can be easily formed in certain areas. If these seemingly minor rust spots are not treated in time, corrosion will gradually spread to the surrounding areas, it will not only affect the appearance of the pre-painted steel sheets but also severely weaken their corrosion resistance and weather resistance performance, thereby shorten the service life of the steel sheets.

In open-air environments, residual metal objects are prone to oxidation upon contact with rainwater or dew, forming surface rust and becoming the "trigger" for the spread of corrosion. Therefore, after the factory building is completed, it is essential to instantly and thoroughly remove all metal debris from the steel plate surface to prevent potential corrosion hazards.

PART.02 repair the damaged paint standardly in steps

After the factory is put into use, it should be inspected and maintained regularly. For areas where the paint has aged or been damaged, touch-up painting can be performed according to the following steps.

1. Surface cleaning: Use a neutral detergent to thoroughly remove dust and other dirt from the damaged area to ensure the repair surface is clean;

2. Fine polishing: Gently polish the aged coating to remove surface rust and clean up any iron powder, rust spots, etc. produced during polishing, ensuring that the repaired area is completely dry and clean;

3. Apply paint in layers: Apply the primer first, then the topcoat, while the surface is clean and dry. It is not recommended to use spray paint for large-area repairs.

PART.03 Routine maintenance and regular cleaning

The long-time accumulation of dust and industrial residues on the roof, in addition to the water accumulation caused by poor drainage during rainy days, will continuously erode the pre-painted steel sheets. Over time, this may lead to coating aging and sheet corrosion.

1. Regularly remove the dust, residue and water from the surface of the pre-painted steel sheet. It is recommended to clean it every six months.

2. If the environment is a coastal area with a high concentration of salt spray or a place with heavy industrial dust, please increase the cleaning frequency according to the specific conditions on site.

3. Normally, rinsing with clean water is sufficient. For stubborn stains, use a mild soap solution or neutral detergent solution, alongside with a soft cloth, sponge, or soft brush to clean. Rinse immediately with clean water after removing the stains.

4. When using detergent, test it on a small area first to confirm that there is no damage before using it on a large area.

If you have any questions regarding the selection, maintenance, or use of pre-painted steel sheets, please feel free to contact us. Xinyu Color Plate provides a one-stop, end-to-end dedicated services, living up to your trust and choice!