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General purpose primer designed for use on porous surfaces. Fully compatible with ASA tile adhesives and most Bostik waterproofing membranes. Acrylic backbone allows it to be used outdoors. ASA Multiprime is a milky pink liquid.




Improves bond

Improves working times

Reduces membrane pin-holes

Seals in minor dust contamination

Helps improve consistency of surface




Priming porous surfaces before tiling or waterproofing

Outdoors and indoors

Floors and walls

Porous surfaces




Tile adhesive, waterproofing membranes or general cement based systems.




Ensure the surface to be primed is correctly installed, suitable for the intended use and adequately prepared.


Use on porous surfaces such as:




Fibre cement







Surfaces must be firm, clean, dry, sound and smooth. All contaminants including grease, oil, wax, curing compounds, dust, plaster droppings and paint must be removed prior to the application. Building boards, timber and particle board flooring must be fixed in accordance to the manufacturer’s directions. Timber and

particleboard flooring normally require sanding or other additional preparation.




If left undisturbed for long periods of time colour separation may occur but this will not affect performance.

Shake or agitate lightly before use to disperse colour evenly.




Ensure the surface has been suitably prepared before priming. In general preparation will include cleaning off any dust or dirt as well as any materials that affects porosity (including oils, sealers, coatings or other contaminants). Some surfaces will require additional preparation


For best results apply with a brush or broom. Apply a liberal amount of Multiprime and work into the pores.

Very porous surfaces may require damping down with water prior to priming and more than one coat of ASA Multiprime may be needed.

Multiprime may also be applied using a roller or sponge but care must be taken to ensure enough is applied and that it is worked into the substrate pores. Remember that it is likely that the porosity will vary across the job. Ensure that enough primer is used on more porous sections. Primed surface should be touch dry before application of adhesive or waterproofing membrane. This will normally take approximately 30 minutes in normal conditions (22 C and 50% relative humidity).


If the surface dries within 10 minutes the surface may have high porosity, not enough primer may have been applied or the ambient conditions may be too hot. In this case is recommended that the installation technique be assessed and changed as required. In very hot and/or low humidity conditions it is recommended that the application be postponed until conditions are more favorable. All workmanship must be carried out in accordance with AS3958.1-2007 and good workmanship Practices




20 litre, 5 litre and 1 litre plastic jerry cans.




Approximately 8m2 per litre depending on porosity of substrate. Exact coverage will vary significantly depending on surface porosity and installation conditions.




ASA Multiprime can be cleaned up using warm water and detergent prior to the product drying. Avoid spilling onto porous surrounds. If this occurs clean up immediately with water.




Unopened containers can be stored for up to 12 months in a cool, dry and weatherproof environment. Do not allow contents to freeze.




Appearance: Opaque pink liquid

Mixing ratio: No mixing

pH: 8 - 9

Specific Gravity: 1.02g/cm




Read entire Technical Datasheet before using

Refer to Material Safety Datasheet (MSDS) before use.

Intended for use only on porous surfaces. When priming non-porous surfaces consider using Ultra NP Primer.

It is advised that the surface porosity is tested before work commences

Do not use on non-porous surfaces such as existing tiles, waterproofing membranes or steel trowel finished concrete.

May be used on water based acrylic paint prior to fixing tiles with a suitable tile adhesive. Refer to the relevant adhesive Technical Datasheet for more information.

In order for this type of primer to work effectively, enough must be applied to penetrate the surface pores. It must be worked into the substrate pores.

Extra care is required when priming very porous surfaces. It is recommended that in these cases the surface is dampened down with a wet sponge immediately prior to priming. More than one coat of primer may be needed.


Avoid applying onto hot surfaces or in very warm or dry conditions. This can lead to the primer flash drying before it can be absorbed into the substrate pores resulting in a surface film and reducing the overall bond strength.

Take care to use enough material when applying with a roller or sponge. These tools can thin out the primer and not work it into the pores. It is recommended that a long nap roller is used and that the primer is flood coated whenever possible. If the primer seems to be drying within minutes it is probable

that not enough is being used.


This product will not consolidate a substrate that is dusting, spalling or otherwise unsound. Additional preparation may be required prior to treatment. The porosity of the surface may vary across the job. Ensure that sufficient primer is applied to each section. 


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