When a flooring or waterproofing system fails prematurely, the root cause is almost never the topcoat.
It is the primer of polyurethane that was treated as a commodity instead of a system component.
It breathes, absorbs, moves microscopically, and interacts with moisture, oil, and chemicals over decades.
A polyurethane primer sits at the most critical interface:
If this interface is weak, even the most expensive coating system will delaminate.
Using Multithane Primer 21 as a reference, let’s examine what separates a best primer of polyurethane from generic alternatives.
Multithane Primer 21 is a 1-K polyurethane primer, eliminating site-mixing errors and ratio deviations common with epoxy primers.
This polyurethane primer is designed to penetrate porous substrates and seal capillaries against:
Epoxy primers often form a surface film; PU primers anchor inside the concrete matrix.
Recommended DFT: 25–50 microns per coat
Multithane Primer 21
Too thick → brittle interface
Too thin → incomplete sealing
This controlled thickness is one reason polyurethane primers outperform cementitious slurries and acrylic sealers over time.
This is critical in parking floors, basements, and industrial areas where failure usually starts at the interface.
The difference was not the coating.
It was the primer strategy.
For proven polyurethane primer systems that deliver long-term adhesion and performance, Contact Multichem Group: info@multichemgroup.net / +91 96190 91025
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