Ardex P51 Primer & Bonding Agent

Description ARDEX P51 Primer & Bonding Agent is a concentrated, blue, synthetic, water-based, solvent-free multi-purpose primer with a wide range of applications which, after drying, helps to inhibit the penetration of water from subsequently applied materials. ARDEX P51 Primer is used to prepare dry internal floors, walls, and ceilings to receive cement-based mortars (levelling compounds, tile adhesives, screeds) as well as plaster-based materials, improving adhesion as a bonding agent and retarding the wetting of the substrate by the applied materials. Effective pore sealer on absorbent sub-floors inhibiting air bubbles rising through subsequently applied sub-floor smoothing and levelling compounds, thus extending their flow life and workability. ARDEX P51 Primer & Bonding Agent can be used to prime and seal the surfaces of cement- or gypsum-plaster-based materials such as wall plaster, floors of cement-based or prepared anhydrite and alpha hemihydrate pumped screeds before applying cement-based products such as levelling compounds and tile adhesives. It can also be used as a bonding agent to improve adhesion to dense and smooth concrete sub-floors and dense cement-based screeds before using repair mortars or cement-based tile adhesives. Suitable for priming rigidly supported and conditioned plywood sub-floors before fixing ceramic tiling with appropriate cement-based tile adhesives. ARDEX P51 Primer can be used as a temporary protective coating over cement-based smoothing compounds and repair mortars where these have to be walked on before the flooring is applied and as a temporary dust-proofing treatment on screeds. Substrate Preparation: Substrates must be dry, protected by a functioning damp proof membrane (DPM), firm, and free from dust, water-soluble materials, excess adhesive residues, and other barriers to adhesion. Surface contamination such as residues of polish, wax, grease, curing agents, etc., should be removed using ARDEX DGR degreaser prior to suitable mechanised preparation. ARDEX P51 Primer & Bonding Agent is not recommended for use on metal and mastic asphalt, excess adhesive residues, ARDEX DPM, polyurethane, and epoxy coatings. Consult the ARDEX P82 Water Dispersed Epoxy Primer and ARDEX R3E General Purpose Epoxy Primer datasheets for guidance. Application: Shake the container well before use and dilute when required by putting the ARDEX P51 Primer into a clean container and mixing with the required quantity of water as specified in the selected mixing ratio. Ensure that the ambient temperature and the temperature of the surface being primed are above 5°C. If ARDEX P51 Primer is used where moisture-sensitive materials are to be subsequently applied, the substrate must be dry, i.e., with flooring materials the screed should have a Relative Humidity (RH) reading not greater than 75% and, where direct to ground, protected by an effective damp proof membrane. Apply the priming coat evenly with a soft broom or brush over the sound, clean, and dust-free surface and leave to dry thoroughly to a clear, thin blue film before beginning any subsequent work. Use in Bonding Coats for Screeds: ARDEX P51 Primer is excellent for improving adhesion of bonded ARDEX A35/A23 Cement and Sand Screeds. Best results are obtained by mixing ARDEX P51 Primer 1:1 with water and then mixing this with a mix of 1 part ARDEX A35 Cement with 1 part Screeding Sand to produce the required bonding slurry/grout consistency. It may also be used to produce a bonding slurry/grout for ordinary cement and sand screeds by simply using ordinary Portland Cement in place of ARDEX A35 Cement. Note: Always apply screed fresh-in-fresh into the bonding coat. Coverage: Mixing Ratio Undiluted on timber floors 1 part P 51:½ part water 1 part P 51:1 part water 1 part P 51:2 parts water 1 part P 51:3 parts water 1 part P 51:5 parts water Dilution None 1:½ 1:1 1:2 1:3 1:5 Approx. Coverage per 5kg unit 25m2 25m2 33m2 60m2 100m2 160m2 NOTE: The above coverage figures will vary depending on the roughness of the surface and absorbency of the substrate. N.B. When using ARDEX P51 Primer on existing substrates, ensure that the residues of levelling compounds, adhesives, etc. are water resistant, sufficiently strong to support anticipated loads and traffic and well adhered to the substrate. Allow priming coats to dry. Always completely remove adhesive residues that are water soluble or softened by water. Where adhesive residues are present on polyurethane, epoxy resin and bitumen based substrates ARDEX P82 must be used as an adhesive bridge. Product Datasheet Click here to view this product on the manufacturers website.