Polyurea Primer Flex: Primer for PVC and EPDM Roofs and Asphalt Felt
Polyurea Primer Flex is a fast-curing, cold-applied two-component pure polyurea primer for PVC and EPDM roofs, asphalt felt and other flexible substrates.
- Product: Polyurea Primer Flex
- Application: primer for waterproofing membranes
- Mix: A=100 : B=10 by weight / A=100 : B=11 by volume
- Consumption: 200–400 g/m²
01 · Uses
Where a primer for PVC and EPDM roofs is needed
- Adhesion layer on flexible substrates (PVC, EPDM, asphalt felt and similar), except polyolefins.
- Renewal of these substrates with liquid-applied membranes, especially hot-applied ones.
Planning the new membrane? Compare hot-spray vs cold-applied systems. For rigid, porous substrates, use Polyurea Primer.
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.
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 check nothing is left unmixed.
Pot life is long enough to apply the resin on top when consumption is higher; in theory aggregate can be broadcast onto it if humidity does not exceed 80%.
Technical datasheet: Polyurea Primer Flex TDS (PDF) · Polyurea waterproofing systems
03 · Technical data
Polyurea Primer Flex technical data (TDS values)
Max. elongation
540%
Tensile strength
19 MPa
Shore hardness
75A
Consumption
200–400 g/m²
Technical data
- Hardness (Shore): 75A
- Max. elongation: 540%
- Tensile strength: 19 MPa
- Adhesion to concrete: >5 N/mm² (EN 13892-8)
- Thermal resistance: stable up to 80 °C
- Mixture: density 0.95–1.00 g/cm³, viscosity 240 mPa·s
04 · Performance
Polyurea Primer Flex performance
It cures to a flexible solid membrane of 75A, with 540% maximum elongation, a tensile stress of 19 MPa, adhesion to concrete above 5 N/mm² (EN 13892-8) and thermal stability 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 effect on its mechanical properties.
Application data
- Mix ratio: A=100, B=10 by weight; A=100, B=11 by volume
- Expected consumption: 200–400 g/m²
- Pot life (100 g): 60 min at 25 °C, 40% RH
- Dry to touch: 35 min (25 °C, 40% RH, 200 g/m²); 60 min (10 °C, 50% RH, 200 g/m²); 40 min (25 °C, 50% RH, 500 g/m²)
- Substrate temperature: 10–25 °C
- Air temperature: 10–30 °C
- 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 Flex: frequently asked questions
Can Polyurea Primer Flex be used on PVC and EPDM?
Yes – it is designed for flexible substrates such as PVC, EPDM and asphalt felt. It is not suitable for polyolefins.
How much is needed?
Expect 200–400 g/m².
How long until it is touch-dry?
35 minutes at 25 °C / 40% RH at 200 g/m², and 60 minutes at 10 °C / 50% RH.
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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