Hi @Cherry,
Thank you for your question about repairing concrete floors in your factory.
If you are looking to repaint the flooring, you'll need to assess how well the old paint is adhered to the concrete. If it is poorly adhered, painting over it is not ideal as it will stick to the existing poorly adhered paint. If this is the case, then you will need to grind all the paint off and start again. If the paint is fairly well adhered, except for the areas with spalling, you can carry out spot repairs.
For spot repairs, you'll have to start by grinding back the paint around the spalling to give yourself a good starting point for the repair. Due to the risks involved with grinding concrete, I would suggest contacting a concrete grinding company for their assistance with this part of the project.
Once the concrete has been ground back to remove the failing paint and give a stable concrete surface for the repair, use this Sika High Strength Epoxy Repair Adhesive Concrete Fix Kit to fill the holes and give a smooth, even surface.
You can then use the Dulux Concrete and Paving Paints, ensuring you use the Sealed Surface Primer over the existing paint and Bare Concrete Primer over the patched areas. You can then have your paint tinted to a wide variety of colours to suit your chosen aesthetic.
Let me know what you think and if you have any further questions, please don't hesitate to ask.
Jacob
