How to paint concrete slabs

The unitary gray can become boring or peel off an old paint. With a fresh coat of paint they bring your concrete slabs to new life. If you take the right steps, choose the right material and invest a little time, this will be thanks to a long lasting coat of paint.

Moisture removal

No matter if you remove an old coat of paint to repaint your concrete slabs, if you need to carry out repair work or if you want to paint new concrete slabs, the basic requirement is a perfectly dry surface and dry weather.

After removing old paint and paint residues with a high-pressure cleaner and then fine cleaning with a brush, soap and water, the concrete slabs must completely dry out. Depending on the outside temperature, this can take between 24 hours and three days. This also applies to the removal of grease or oil stains with trisodium phosphate.

For repair work, such as filling cracks or holes in the concrete slabs, the concrete putty must also be completely dry. If in doubt, wait a day longer to apply the primer. If the concrete slabs are fresh, that is, not more than a month has passed since the concrete slabs were cast, you should wait until this time has elapsed. Only then is the complete internal drying of the concrete slabs assured.

Use special products

Due to the uneven loading of the later color by walking and abrasion against walls, you should only use primers and paints that have been produced for this purpose. Special floor paints or concrete glazes also guarantee a breathing of the concrete, which prevents air damage from later bursting paint damage. When applying primer, impregnation and paint, apply several thin coats with generous drying times to increase durability.

Step by step instructions

  • Floor paint
  • Concrete putty
  • Floor primer
  • Trisodium phosphate
  • Barrier tape
  • Eventual rain protection film
  • High-pressure cleaner
  • (wire) brush, cloth, soap, water
  • Paint rollers, tassels, wide brush
  • If necessary paint spray

1. Clean the Concrete slabs

All soiling and old paint must be removed from the surfaces of the concrete slabs. In the field, a high-pressure cleaner helps. Use the wire brush to brush the surfaces "nude" and wipe off dirt dust.

2. Repairs and repairs

Repair or fill cracks, holes and other damages with concrete filler. After drying, level with the wire brush and remove dirt again. Wear respiratory protection when using trisodium phosphate.

Apply 3rd primer

Apply special primer in one to two coats. Make sure the color or type matches the primer. Let it dry out.

4. Apply floor paint in several layers

Spray, roll or spread the special floor paint in three to five layers. Observe the dry phase between each coat according to the manufacturer's instructions.

5. Protecting paint

Make the freshly painted concrete slabs inaccessible with a barrier tape. When covering, ensure sufficient air supply.

Tips & TricksIf the surface of your concrete slabs consists of round or crushed grains, glazing is unsuitable. In this case sprayed or sprayed paint is recommended.
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