Bit Seal Primer

Solvent-free, bitumen primer for treating substrates before applying a bitumen waterproofing product

Product Description

• Bit Seal Primer is a one-component, solvent-free bitumen emulsion with good workability properties.
• Bit Seal Primer may be applied by brush or roller and is resistant to aggressive substances.
• Bit Seal Primer dries quickly.
• Bit Seal Primer consolidates and improves bonding of Bit Seal waterproofing treatments applied later. • Bit Seal Primer is resistant to ageing and adheres to dry substrates.
• Bit Seal Primer may be applied both internally and externally.

Field of Application

For waterproofing and protecting:

• Before waterproofing foundations.

• Before waterproofing bearing walls.

Product Details

Product identity

Consistency: liquid
Colour: black
Density (g/cm³): 1.05
pH: 10
Brookfield viscosity (mPa•s): 450
Dry solids content (%): approx. 25


Bit Seal Primer is supplied in:
– 5 kg plastic buckets
– 20 kg plastic buckets


The approximate consumption is 0.2 – 0.5 kg/m2

Application Procedure

Preparing the substrate

The substrate to be treated must be mechanically robust and clean. Remove all cement laitance, traces of powder, flaky parts, grease, oil, and form release agents by sandblasting or washing down with a high-pressure water pump. If the substrate to be waterproofed and protected with Bit Seal Primer is in poor condition, remove the damaged parts manually or mechanical abrasion by using a hydro-demolition system or a hydro-scarified. The last technique, which uses high-pressure water, is recommended because the reinforcement rods are not damaged. The structures that are not subject to vibration could cause small cracks in adjacent concrete. Once the rust has been entirely removed by sandblasting, repair with a pre-blended repairing mortar. Absorbent surfaces to be treated with Bit Seal Primer must be primed with Bit Seal Primer. Existing floors, which are covered in tiles, must be well bonded to the substrate, and the surface of tiles must be free of substances that could compromise the adhesion of Bit Seal Primer, such as oil, grease, paint, wax, etc. In order to remove material that could affect the adhesion of Bit Seal Primer, clean the floor with detergents and water. After this, the surface must be treated with Bit Seal Primer.

Preparing the product

Ready to be used.

Applying the product

Bit Seal Primer must be applied in two layers with a brush or a long-haired roller. Before applying the second layer, wait until the first coat is dry, making sure the product becomes darker with a matt finish. The second layer is applied diagonally to the first one. The final thickness of the two layers of Bit Seal Primer must be at least 0.8 mm to create a solid, flexible, and continuous film. Ensure there are no interruptions in the film caused by imperfections in the substrate.