Polyurea Primer: Fast-Curing Pure Polyurea Primer for Concrete
Polyurea Primer is a fast-curing, cold-applied two-component pure polyurea primer for concrete and other rigid, porous, dry substrates.
- Product: Polyurea Primer
- Application: primer for waterproofing membranes
- Mix: A=100 : B=10 by weight / A=100 : B=10.5 by volume
- Consumption: 300–400 g/m²
01 · Uses
What a pure polyurea primer for concrete does
- Adhesion layer on rigid, porous and dry substrates.
- Sealer and consolidator for concrete and cement before polyurethane or polyurea waterproofing membranes.
Moisture and overcoat timing decide whether a primer works – see dew point, residual moisture and overcoat interval. For flexible substrates, use Polyurea Primer Flex.
02 · Application
Substrate requirements and mixing
The substrate needs a cohesion of at least 1.5 MPa and compressive strength of at least 25 MPa. It must be completely free of water and water vapour, with moisture below 4%, and clean of oil, grease, cured product and anything that could hinder adhesion. On fresh concrete or mortar, wait at least 21 days; if moisture is suspected, use a suitable primer for damp substrates.
Stir component A mechanically at low speed for about 2 minutes to avoid air intake, pour in component B and mix the same way for 2 minutes, then transfer to a larger container to make sure nothing is left unmixed. A surface skin can form in the container on contact with air; remove it and carry on.
Technical datasheet: Polyurea Primer TDS (PDF) · Polyurea waterproofing systems
03 · Technical data
Polyurea Primer technical data (TDS values)
Consumption
300–400 g/m²
Shore hardness
70D
Tensile strength
37 MPa
Adhesion to concrete
>5 N/mm²
Technical data
- Hardness (Shore): 70D
- Density after curing: 1.35 g/cm³
- Max. elongation: 53%
- Tensile strength: 37 MPa
- Adhesion to concrete: >5 N/mm² (EN 13892-8)
- Thermal resistance: stable up to 80 °C
- Mixture: density 0.90–0.95 g/cm³, viscosity 95 mPa·s
04 · Performance
Polyurea Primer performance
It cures to a hard film of 70D, with a tensile stress of 37 MPa, maximum elongation of 53% and adhesion to concrete above 5 N/mm² (EN 13892-8), and remains thermally stable up to 80 °C.
Curing time depends strongly on conditions: the higher the temperature and humidity, the faster it cures and the shorter the working time. It is aromatic, so it yellows in sunlight without any loss of mechanical properties.
Application data
- Mix ratio: A=100, B=10 by weight; A=100, B=10.5 by volume
- Expected consumption: 300–400 g/m²
- Pot life (100 g): 60 min at 25 °C, 40% RH
- Dry to touch at 200 g/m²: 25 min at 25 °C / 40% RH; 45 min at 10 °C / 50% RH
- Substrate temperature: 10–25 °C
- Air temperature: 10–30 °C, relative humidity not above 60%
- Fresh concrete or mortar: wait at least 21 days
- Storage: 10–30 °C, dry; 12 months from manufacture in the original sealed container
05 · FAQ
Polyurea Primer: frequently asked questions
Which substrates is Polyurea Primer for?
Rigid, porous and dry substrates such as concrete and cement-based surfaces.
How much primer is needed?
Expect 300–400 g/m².
How soon can it go on new concrete?
Wait at least 21 days on fresh concrete or mortar so the substrate can dry.
More Impermax and Rayston polyurea products
Every product page in this series is based on its official Krypton Chemical technical datasheet.
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