Mapei Eco Prim T Plus: A Technical Overview
Mapei Eco Prim T Plus is a ready-to-use, water-based acrylic primer engineered for professional flooring preparation. Designed for internal use, it offers superior bonding on cementitious screeds, anhydrite, wood, marine plywood, terrazzo, ceramic, and natural stone. Its low VOC formula contributes to Green Star™ credits and ensures a safe, installer-friendly working environment. With excellent resistance to water and ageing, Eco Prim T Plus delivers reliable, long-lasting adhesion that helps prevent costly callbacks.
Core Features & Specifications
- Solvent-free, low VOC primer – safe for installers and contributes to Green Star™ credits
- Excellent adhesion on absorbent and non-absorbent substrates, including existing tile and adhesive residues
- Flexible, water and ageing resistant for long-term reliability
- Ready to use – can be diluted 1:2 for highly absorbent cementitious surfaces
- Fast drying – 2–5 hours typical wait before applying levelling compounds
- Available in 5 kg and 20 kg pails for small to large projects
The Mapei Eco Prim T Plus Advantage
- Saves time with easy brush or roller application
- Minimises call-backs thanks to its superior bonding properties
- Supports compliance with Australian environmental and workplace safety standards
Proactive Troubleshooting
Scenario: Applying on substrates with rising damp
Potential Outcome: Poor adhesion and potential delamination of levelling compounds.
Adheseal Best Practice: Always test for moisture and install an appropriate vapour barrier before priming.
Scenario: Waiting too long before applying smoothing compound
Potential Outcome: Reduced bond strength and uneven results.
Adheseal Best Practice: Apply levelling compounds within 24 hours of primer application for best results.
Applications in Practice: Trade Scenarios
For Tilers (On-Site Applicator): Preparing Smooth Concrete
The Professional's Challenge
Highly compact concrete surfaces can lead to poor adhesion of levelling compounds and tile adhesives, risking tile failure.
The Adheseal Solution
Apply Eco Prim T Plus diluted 1:2 with water for maximum penetration. This creates a grippy surface, ensuring tile systems bond securely.
Best Practice Note
Use a roller for even coverage and allow 2–3 hours drying time before proceeding.
For Builders (Specifier/Architect): Mixed Substrate Projects
The Professional's Challenge
Projects often involve different substrate types, complicating primer selection and risking inconsistent results.
The Adheseal Solution
Eco Prim T Plus adheres to cementitious, wood, ceramic, and adhesive residues, allowing one solution across multiple areas.
Best Practice Note
Specify Eco Prim T Plus in tender documents to standardise preparation and prevent inconsistent performance.
Frequently Asked Questions
Can Eco Prim T Plus be used on substrates with rising damp?
No. Eco Prim T Plus must be applied only to dry substrates. For screeds over bare ground or lightweight concrete, install a vapour barrier first to avoid adhesion failure.
How long can I wait before applying the levelling compound?
Apply levelling compounds within 24 hours of priming. Waiting longer can reduce bond strength and may require re-priming.
Should Eco Prim T Plus be diluted?
Yes, dilute 1:2 with clean water for absorbent cementitious substrates. Use undiluted on ceramic, natural stone, wood, and adhesive residues.
What is the coverage rate of Eco Prim T Plus?
Coverage varies from 0.10 – 0.20 kg/m² depending on substrate porosity and application method (roller or brush).
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Priming compact or smooth concrete floors before levelling | Creates a high-bond surface ensuring levelling compounds adhere reliably | Tilers, Flooring Installers |
| Surface preparation over old adhesive residues | Bonds to water-resistant residues, avoiding costly full removal | Remedial Contractors, Builders |
| Priming ceramic or natural stone substrates | Allows direct application of smoothing compounds without tile removal | Tilers, Builders |
| Bonding aid over epoxy or polyurethane vapour barriers | Provides a secure bond where no sand broadcast is present | Waterproofers, Flooring Installers |
| Preparation of timber, plywood, or chipboard subfloors | Seals surface, prevents uneven absorption, and improves adhesion | Builders, Flooring Contractors |
Applying Mapei Eco Prim T Plus: Enhanced Protocols & Best Practices
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Surface Preparation
Ensure the substrate is sound, dry, and free of contaminants. For unbonded screeds, verify a vapour barrier is installed to prevent rising damp.
Pro Tip: Always test moisture levels in concrete before priming – high moisture can compromise adhesion and void warranties. -
Mixing & Dilution
Use Eco Prim T Plus as supplied for non-absorbent substrates. Dilute 1:2 with water for absorbent screeds and concrete to ensure proper penetration.
Pro Tip: Mix thoroughly before use to maintain a uniform consistency and avoid patchy coverage. -
Application
Apply with a brush or roller, ensuring complete coverage without pooling. Avoid leaving puddles, which can create weak spots in adhesion.
Timing: Drying time is approx. 2–5 hours depending on temperature and humidity. Do not wait longer than 24 hours before applying levelling compounds. -
Clean Up
Clean tools, hands, and spills immediately with water. Once cured, remove with alcohol or Mapei Pulicol 2000.
Pro Tip: Keep a bucket of clean water and cloths nearby during application to make cleanup fast and efficient.
Limitations & Safety
Product Limitations
Apply only to internal floors. Not suitable for substrates subject to rising damp or moisture movement.
Not recommended for magnesium-based substrates. Use Mapei Primer EP or Mapeprim SP instead.
Do not leave more than 24 hours between priming and applying smoothing compounds. Re-prime if exceeded.
Safety & Handling Requirements
Personal Protective Equipment
Wear protective gloves and safety goggles during application. Use work clothing that prevents skin contact.
Ventilation Requirements
Ensure adequate ventilation when working indoors, although Eco Prim T Plus is low VOC and installer-safe.
Fire & Handling Precautions
Product is non-flammable. Store in sealed containers and avoid freezing conditions.
Emergency First Aid
Eyes:
Rinse immediately with plenty of water for at least 15 minutes. Seek medical attention if irritation persists.
Skin:
Wash thoroughly with soap and water. Remove contaminated clothing.
Inhaled:
Move to fresh air. Seek medical attention if symptoms such as coughing or dizziness occur.
Swallowed:
Do not induce vomiting. Rinse mouth and seek medical attention immediately.
Seek medical attention immediately in all cases of serious exposure.
Mapei Eco Prim T Plus Application Guide
Concrete & Cementitious Screeds
Surface Preparation
Ensure the surface is structurally sound, uniformly dry, and free from dust, laitance, oils, and contaminants. Check moisture content and provide a vapour barrier if installed over bare ground or lightweight screeds.
Primer Requirements
Primer required for proper bonding of levelling compounds
Dilute Eco Prim T Plus 1:2 with clean water for highly absorbent screeds, apply by roller or brush, allow 2–3 hours to dry before proceeding.
Existing Ceramic & Natural Stone
Surface Preparation
Degrease and clean thoroughly, removing waxes and residues. Roughen smooth, glossy tiles if needed to improve key.
Primer Requirements
Use Eco Prim T Plus undiluted
Apply directly to tiles using a roller for even coverage. Allow 4–5 hours to dry before smoothing compound or adhesive application.
Timber, Plywood & Chipboard
Surface Preparation
Use only moisture-stable wood. Ensure boards are fixed securely, clean, and free from dust or oils.
Primer Requirements
Eco Prim T Plus required for levelling compounds
Apply one even coat undiluted with a brush or roller. Allow 2–3 hours drying time.
Substrates with Epoxy or PU Vapour Barriers
Surface Preparation
Ensure the vapour barrier is fully cured (typically 2–4 hours depending on product) and free from dust. Do not wait longer than 24 hours before priming.
Primer Requirements
Eco Prim T Plus required when no broadcast sand layer is present
Apply one coat undiluted to create a bonding bridge for smoothing compounds up to 10 mm thick.
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