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Everflex Multi-Prime is a high-performance water-based acrylic primer formulated to ensure substrate moisture testing compliance and superior membrane adhesion in professional tiling and waterproofing environments.
This solvent-free, Green Star compliant solution provides a resilient bond to challenging surfaces like burnished concrete and glazed ceramic tiles when applied neat, or regulates suction on porous masonry when diluted.
Engineered for rapid-turnaround projects, it cures to a translucent, tack-free film in approximately one hour while using built-in biological growth inhibitors to protect the interface behind waterproofing membranes.
Frequently Asked Questions
What surfaces can Everflex Multi-Prime be applied to?
Everflex Multi-Prime is suitable for both porous substrates (like concrete, screeds, render, cement sheet, timber) and non-porous surfaces (such as ceramic tiles, waterproofing membranes, and burnished concrete). Ensure all surfaces are cured, dry, and clean for optimal adhesion performance.
How do I know whether a surface is porous or non-porous before applying Everflex Multi-Prime?
Use the water droplet test: place a small puddle of water (around the size of a $1 coin) on the surface. If it absorbs in under 2 minutes, it's porous. If the water remains on the surface, it's non-porous. This determines whether to apply Multi-Prime neat or diluted.
What is the correct dilution ratio of Everflex Multi-Prime for porous substrates?
For standard porous substrates, dilute 1 part Multi-Prime to 2 parts water. For highly porous or absorbent substrates, you may increase dilution to 1:3. Always apply with a roller or brush and allow 30 minutes to dry before overcoating.
Can Everflex Multi-Prime be used externally or in wet areas?
Yes, Everflex Multi-Prime is suitable for internal and external use, including wet areas. It helps prevent mould growth in humid environments and provides a secure base for waterproofing membranes. Avoid application in rainy conditions or on damp surfaces.
How long should I wait before applying waterproofing or tile adhesives over Everflex Multi-Prime?
Allow Everflex Multi-Prime to dry to a translucent, tack-free film, typically within 1 hour at 23°C. Atmospheric conditions like humidity and substrate porosity may affect dry times. Once cured, proceed with tiling, levelling, or waterproofing as specified.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Priming porous concrete or screeds before tiling | Improves adhesive bond and prevents over-absorption of tile adhesives | Tilers, Builders |
| Surface prep for waterproofing membrane systems | Ensures consistent membrane bond across varied substrates | Waterproofers, Remedial Contractors |
| Primer before applying self-levelling floor compounds | Prevents pinholing and slab suction for level finish | Flooring Contractors |
| Recoating ceramic tile surfaces (abraded) | Enables strong adhesion of membranes or levellers over tiles | Tilers, Waterproofers |
| Bond enhancer for timber and cement sheeting systems | Minimises movement-induced delamination in flexible underlayment builds | Builders, Carpenters |
Applying Everflex Multi-Prime: Enhanced Protocols & Best Practices
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1. Surface Preparation
Ensure substrates are dry, clean, structurally sound, and free from oils, dust, curing compounds, or any contaminants. Cure times vary—e.g. 28 days for concrete and 4 days for render/screed.
Mechanical Preparation
Use diamond grinding or sanding for difficult or smooth substrates. Avoid acid etching.
Cleaning
Vacuum dust thoroughly. Remove surface water or continual dampness before priming.
Timing: Concrete: 28 days curing minimum. Screeds: 4 days minimum.Pro Tip: Avoid applying primer on surfaces with high moisture or visible condensation—test with moisture meters if unsure. -
2. Application on Porous Substrates
Dilute Everflex Multi-Prime 1:2 with clean water for general porous surfaces (e.g. cured concrete). Apply with roller or brush ensuring complete coverage.
High Porosity Substrates
Use a 1:3 dilution for very porous surfaces and apply a second coat if needed.
Standard Porosity
Dilute 1:2 with water and apply a single even coat.
Timing: Allow 30 minutes for the first coat to cure before applying any subsequent coats or systems.Pro Tip: Surface should remain visibly wet for at least 2 minutes—this ensures correct substrate absorption. -
3. Application on Non-Porous Substrates
Use Everflex Multi-Prime undiluted (neat) for non-porous substrates like ceramic tiles, burnished concrete or waterproof membranes.
Surface Etching (Optional)
Light sanding or mechanical abrasion may enhance bond strength on high-gloss tiles or sealed surfaces.
Direct Application
Apply a single neat coat with brush or roller ensuring a uniform, opaque film across the surface.
Timing: Allow to dry to translucent, tack-free film (approx. 1 hour @ 23°C).Pro Tip: Do not apply to high-gloss ceramic tiles unless abraded—bond may be compromised.
Limitations & Safety
Product Limitations
Not suitable for damp, wet, or saturated substrates. Use Everflex VBS for moisture-blocking applications.
Do not apply below 10°C or above 35°C. Environmental extremes may impair adhesion or drying.
Limited UV resistance. Product must be overcoated—do not leave exposed for extended periods.
Not designed for use where hydrostatic pressure or rising damp is present.
Do not apply onto glossy ceramic tiles without abrasion—insufficient bond strength may result.
Safety & Handling Requirements
Personal Protective Equipment
Wear standard work overalls, nitrile gloves, and safety glasses during handling. Avoid skin or eye contact. Wash hands after use and before eating, drinking, or smoking.
Ventilation Requirements
Ensure adequate ventilation during indoor application. Though low VOC and low odour, avoid confined spaces without air movement.
Fire & Handling Precautions
Non-flammable and solvent-free. Avoid contamination with incompatible materials. Store sealed in a cool, dry location below 30°C.
Emergency First Aid
Eyes:
Flush immediately with clean running water for at least 15 minutes. Seek medical attention without delay.
Skin:
Remove contaminated clothing. Wash skin thoroughly with soap and water. Seek medical advice if irritation occurs.
Inhaled:
Move to fresh air immediately. Seek medical attention if symptoms persist.
Swallowed:
Rinse mouth and give a glass of water. Do not induce vomiting. Contact Poisons Information Centre (AU: 13 11 26).
Seek medical attention immediately in all cases of serious exposure.
Everflex Multi-Prime Application Guide
Concrete (Cured)
Surface Preparation
Allow concrete to cure for a minimum of 28 days. Remove laitance, dust, oil, and curing compounds. Mechanically abrade smooth surfaces if necessary. Ensure the surface is dry and free of surface water before priming.
Primer required for critical applications
Dilute Multi-Prime 1:2 with clean water. Apply evenly and allow 30 minutes to cure before proceeding.
Everflex Multi-PrimeCeramic Tiles (Non-Glossy)
Surface Preparation
Ensure tiles are clean, dry, and free from oils, waxes, or sealers. For glossy tiles, abrade the surface lightly to enhance adhesion. Avoid use on high-gloss or glazed finishes without prep.
Primer required for non-porous bonding
Apply Multi-Prime neat (undiluted) with roller or brush. Let dry to translucent film before overcoating.
Everflex Multi-PrimeSand & Cement Screeds (3:1 Ratio)
Surface Preparation
Allow screed to cure for at least 4 days. Remove dust and surface laitance. Ensure dry and well-bonded to underlying slab before priming.
Primer required for absorbent substrates
Dilute Multi-Prime 1:2 with water. Apply evenly and allow 30 minutes to dry.
Everflex Multi-PrimePrecast Concrete Panels
Surface Preparation
Remove all release agents, oils, or surface coatings. Rinse and lightly abrade if necessary. Substrate must be dry and free from contamination.
Primer recommended for uniform bond
Apply diluted Multi-Prime (1:2) if porous, or neat if non-porous. Evaluate surface porosity with water test.
Everflex Multi-PrimeStructural Plywood / Timber (Type A)
Surface Preparation
Ensure sheets are securely fixed and clean. Remove dust, wax or oils. Protect edges from moisture ingress. Light sanding may be needed for smooth boards.
Primer recommended for adhesion enhancement
Use diluted Multi-Prime (1:2) for even absorption. Allow full drying before further layers.
Everflex Multi-PrimeWaterproof Membranes (Existing)
Surface Preparation
Ensure membrane is fully cured, clean, and dry. Lightly abrade smooth or glossy finishes. Remove any contaminants that could inhibit bonding.
Primer required for membrane overcoat systems
Apply Multi-Prime neat. Allow full cure before applying compatible membrane or tile adhesive.
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