MULTI PU Primer

Description

MULTI PU PRIMER is a trowel applied polyurethane floor screed primer for medium to heavy duty industrial use. Using the same resin technology as the PU Screeds it gives a continuity with the high chemical, abrasion, and impact resistance, with a good bond onto concrete substrates. For use in environments that range from cold rooms to boiler rooms, warehousing to shop floors that require a PU primer prior to application of PU screeds.

Typical Applications

MULTI PU PRIMER can be used as a primer prior to PU screed installations in food processing plants, cold rooms, canning factories, bottling plants, high foot traffic areas and environments where food safety and medium to heavy industrial use are both prerequisites.

Advantages

• Economical
• High early strength
• High chemical resistance
• High impact resistance
• High density
• Nonhazardous (food safe)
• Seamless
• Flow applied for rapid installation
• Low maintenance
• Excellent bond to concrete

Silver Ion Technology

For HACCP environments, the inclusion of Silver Ion Technology gives the polyurethane screed permanent bactericidal properties. Only included on request.

Typical Properties

Watch Points

• While polyurethane screeds are chemically resistant, they can still stain and a sealer coat is recommended in areas where concentrated dyes, or foods or chemicals with staining history are exposed to the screeds for long periods of time.
• A formal hygienic cleaning procedure is required to keep the surfaces hygienically clean and food safe.
• Polyurethane screeds are not UV stable and will yellow under bright lighting and sunlight.

Directions for Use

Application Conditions: Application temperature should be between 15C and 25C. Employ the use of localized cooling or heating equipment if necessary. Try avoid applying over hot surfaces or previously heated areas. Substrates must have a moisture content of 12% maximum and tensile strength of 1.5 N/mm² minimum.

Surface Preparation: Surfaces need to be cleaned and flattened or imperfects will show through flow applied applications. Light grinding to remove all surface defects is recommended. Scabbling and acid etching is not recommended. If the substrate is porous or there is expected to be pin hole issues or moisture concerns, a application of MULTI PU PRIMER is used. Anchor grooves are to be cut at twice the thickness of the floor finish to a maximum of 10mm. Anchor grooves are to be cut around the floor perimeter, parallel to expansion joints, around upright structures, around drains, parallel to door thresholds, and at regular 3 meter spacing across the floor surface.

Priming: Use a coat of MULTI PU PRIMER to prime the floor surface, making sure not to fill anchor grooves. Ensure even coverage using a mohair roller until the surface is completely wetted out. Apply in anchor grooves with a brush. Allow to sure for 12 hours and if dry patches appear, a second application of primer is required. Allow to cure for a further 12 hours. If the primer is left for longer than 48 hours, the primer will need to be abraded and a further coat of PU screed to prevent pin holing of the final screed topping. If moisture is a concern, prime with MULTI PU LC coating at 500 µm thickness using a trowel and allow to cure for 12 hours. If no blistering or pin holing occurs, continue with the final screed topping.

Application: Shake well the resin component to resuspend all the ingredients in the liquid. In a pot mixer, premix the resin and the hardener until mixed together. While mixing, add in the powder aggregate gradually until all wetted out and lump free. Then transfer the mix onto the primed surface and level to the required thickness using a steel trowel. Once level, use a spike roller to remove stubborn trowel lines and reaerate the screed. Do not spike roll beyond initial set (3-5 minutes of application) or the screed will not self-level and roll marks will remain in the screed. Ensure that anchor grooves are filled completely. Scatter with No. 1 SAND if a textured finish is required for better mechanical bond with the PU screeds to follow. Allow the screed to cure for 12 hours. Protect the curing floor from damp, condensation and direct water for at least 24 hours.

Limitations: Do not apply in humidity is expected to be greater than 90% RH, or if the surface temperature is less than 3C above the dew point. Ensure that the curing temperature never drops below 5C, and do not apply over concrete that is less than 25 MPa compressive strength. Colour variations can occur between batches so apply sections from the same batch of resin. Touching up will always be visible and should be avoided. To guard against discoloration from contact with strong oxidizing agents such as halogens, seal with MULTI UV SEALER clear matt. Direct contact with rubber or bituminous type materials will leave black marks within the first month of use as the MULTI PU COATING is still actively curing.

Equipment Care

All tools should be cleaned with thinners or xylene immediately after use.

Packing

Supplied in 6LT RESIN, 3.5LT HARDENER and 5KG AGGREGATE.

REVISION: R3.1