Vendor: Virtus Resins
Flowdur Primer is a two-component virtually solvent free flexible polyurethane primer. Unlike many other primers, Flowdur Primer is flexible which can compensate for movement in the substrate.
The concrete substrate must be at least 28 days old, sound with a minimum compressive strength of 25 N/mm2 and a minimum pull off strength of 1.5 N/mm2. The substrate must be clean, dry with a moisture content less than 5% (75% RH) and free of all contaminants such as dirt, oil, grease, coatings and surface treatments, etc. The substrate should be free from rising damp and ground water pressure and contain a functional damp proof membrane. Inadequate preparation will lead to loss of adhesion and failure. Grinding, vacuum-contained shot-blasting or planing is recommended depending on the final finish to be applied. Percussive scabbling or acid etching is not recommended.
Coverage varies widely due to the porosity and profile of different substrates. As a guide:
Rough porous concrete - 175 g/m²
Average finish - 125 g/m²
Smooth finish - 100 g/m²
Drying Times: Overcoating time is between 8-36 hours.
Add the hardener component to the resin component and mix using a low speed electric mixer (200 - 500 rpm) fitted with a mixing paddle designed to minimize air entrainment for 1 - 2 minutes until homogeneous. Care should be taken to ensure that any material adhering to the sides and bottom of the mixing vessel is thoroughly mixed in otherwise uncured patches may result.
Once mixed the primer should be applied immediately in a thin continuous film Work the primer into the surface using a stiff brush or roller avoiding pooling.
On porous surfaces Flowdur Primer will be absorbed very quickly leaving dry patches. A second coat should be applied to these dry areas to ensure good adhesion and reduce the possibility of air release from the substrate causing bubbles or pin holing in the final topping.
Flowdur Primer Technical Data Sheet
Safety Data Sheets