Centrecoat Armourcoat 3-350 Primer

Centrecoat Armourcoat 3-350 Primer is a 2 part epoxy primer with good penetrating properties for use on concrete & polymer modified cementitious screeds prior to application of Centrecoat Armourcoat 3-350.

Best Uses

Centrecoat Armourcoat 3-350 Primer is formulated to improve the adhesion of Centrecoat Armourcoat 3-350 to the floor substrate. Armourcoat 3-350 Primer benefits from low viscosity to penetrate the substrate, while sealing the concrete pores, reducing the potential for out gassing and pin-holing in the subsequent resin floor finish.

Centrecoat Armourcoat 3-350 Primer is suitable for application to thoroughly prepared concrete, polymer modified sand and cement screeds, steel, brickwork, block work and timber.

Application

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. Precussive scabbling or acid etching is not recommended.

Oil and Grease
For large areas of contamination, use hot compressed air treatment. Small, isolated contamination should be removed using an appropriate degreaser, rinsed thoroughly and allowed to completely dry. A coat of Armourcoat Oil Tolerant Primer should then be applied (see separate datasheet).

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 entrapment 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 Centrecoat ArmourCoat 3-350 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.