What is ACTFLEX 400 Clear used for?

400 Clear is a clear waterproofing membrane that applies directly over existing tiles, grout, and brick - eliminating the need to demolish and retile a leaking bathroom, shower, or balcony. Bonds to ceramic, porcelain, and most stone tiles.

How long does the waterproofing last?

ACTFLEX 400 Clear provides up to 5 years of UV-resistant waterproofing over existing tiles - a major service-life extension compared to repeated grout/silicone repairs. Maintains the original tile appearance with a semi-gloss finish.

How thick should I apply it?

Apply at 0.2mm DFT over tiles or 0.5mm DFT over exposed grout, in 2-3 coats. Coverage is 3 m² per kg. Touch-dry in 120 minutes at 20°C, recoat after 4 hours, waterproof in 3 hours, full cure 72-120 hours.

What surface prep is needed?

Clean the existing tiles thoroughly to remove all dirt, grease, mould, and loose grout. Repair any cracked tiles first. The 400 Clear chemistry depends on a clean sound substrate - skipping prep leads to bond failure.

Is this a permanent fix?

400 Clear is a remedial system providing up to 5 years of protection. For new-build AS3740-compliant waterproofing, use the under-tile ACTFLEX 906 WPU or 929 system instead. 400 Clear is the right choice when tile removal isn't viable.

ACTFLEX 400 CLEAR WATERPROOFING MEMBRANE STOPS LEAKS

ACTFLEX 400 CLEAR Waterproofing Membrane

4 reviews

115+ bought this month

ACTFLEX 400 CLEAR Waterproofing Membrane

$140.00

BEST SELLER

or 4 interest-free payments with

ACTFLEX 400 is a transparent, single-pack co-polymer emulsion combined with synthetic rubber latex, engineered to provide a UV-resistant, waterproof barrier. Designed for application over existing tiled surfaces, it eliminates the need for tile removal while ensuring superior waterproofing protection. This tough, durable, and flexible membrane features a semi-gloss transparent finish and is suitable for foot traffic. Ideal for preserving the original appearance of substrates, it is perfect for tiled shower areas, balcony decks, podium levels, and face brick walls.

Apply directly over tiles — no removal needed

UV-resistant protection lasting up to 5 years

Maintains original appearance with semi-gloss finish

Size: 3 KG

1 Kg$65.00Sold out3 KG$140.007 KG$257.00

Quantity: 1

7-Day Money BackGuarantee

Fast DispatchNext Business Day

Expert Advice(02) 8021 3517

Secure CheckoutSSL Encrypted

Get it — —

Pickup available at The Waterproofing Shop

Usually ready in 24 hours

ACTFLEX 400 CLEAR Waterproofing Membrane

3 KG

The Waterproofing Shop

Pickup available, usually ready in 24 hours

22/872 Canterbury Road
Roselands NSW 2196
Australia

+61280213517

Product Details

Coverage Info: 3 m² per 1kg depending on surface

TDS-ACTFLEX 400 CLEAR

Calc Coverage: 2–3 coats, ~200–500 microns thicknessTDS-ACTFLEX 400 CLEAR
Waterproof Time: 3 hour at 25°C, 50% RHTDS-ACTFLEX 400 CLEAR
Opening Usable: 12 months after openingTDS-ACTFLEX 400 CLEAR
Drying Time: Touch dry 120 min at 20°C; 60 min at 30°CTDS-ACTFLEX 400 CLEAR
Vapor: Not a vapour barrier; not for rising dampTDS-ACTFLEX 400 CLEAR
App Temp: +10°C to +26°C (do not apply if rain is forecast within 24 hrs)TDS-ACTFLEX 400 CLEAR
Shelf Life: 12 months (sealed container, cool/dry storage)TDS-ACTFLEX 400 CLEAR
Colour: Transparent, semi-glossTDS-ACTFLEX 400 CLEAR
Membrane Class: Temporary waterproofing top coat
Tack Free Time: 120 minutes at 20°CTDS-ACTFLEX 400 CLEAR
Recoat Time: 4 hours minimum between coatsTDS-ACTFLEX 400 CLEAR
Elongation: 100%TDS-ACTFLEX 400 CLEAR
Chemical Resistant: Good (protect from chemicals, dyes, stains)TDS-ACTFLEX 400 CLEAR
Full Cure: 72–120 hours at 25°C, 50% RHTDS-ACTFLEX 400 CLEAR
Thickness: 0.2 mm over tiles, 0.5 mm over grout/jointsTDS-ACTFLEX 400 CLEAR
Chemical Base: Co-polymer emulsion with synthetic rubber latexTDS-ACTFLEX 400 CLEAR
Cure Mechanism: Water evaporation and film formation
Tear Resistance: Flexible but not rated for high point loadsTDS-ACTFLEX 400 CLEAR
Service Temperature: Designed for ambient external/wet conditions; not for submerged or ponding waterTDS-ACTFLEX 400 CLEAR
Solid Contents: 45%TDS-ACTFLEX 400 CLEAR
Bond Strength: Bonds to most substrates; compatibility testing requiredTDS-ACTFLEX 400 CLEAR
Density: Approx. 1.0–1.1 g/cm³ (liquid resin typical)
Compressive Strength: N/A (coating, not structural)
Flow: Brushable, rollable, or trowel-applied liquid

How to Use

Apply by brush or roller in two coats

Technical Specifications

Colour: Transparent, semi-gloss
Solid Contents: 45%
Density: ~1.0–1.1 g/cm³
Tack Free Time: 120 minutes @ 20°C
Recoat Time: 4 hours @ 25°C, 50% RH
Elongation at Break: 100%
Full Cure: 72–120 hours @ 25°C, 50% RH
Waterproof Time: 3 hours @ 25°C, 50% RH
Application Temperature: +10°C to +26°C
Recommended Thickness: 0.2 mm over tiles, 0.5 mm over grout/joints
Coverage: 3 m² per 1 kg depending on surface
Bond Strength: Bonds to most substrates; compatibility testing required
Chemical Resistance: Good
Available Sizes: 1 kg / 3 kg / 7 kg
Shelf Life: 12 months (sealed, cool/dry storage)

Product Files

ACTFLEX 400 CLEAR Waterproofing Membrane3 KG

$140.00

Add it to your kit

Frequently bought together

This item

ACTFLEX 400 CLEAR Waterproofing Membrane $140.00
Add

Soudal T-Rex Crystal $19.90
Add

Forspec Epoxy Mixing Paddle Mixer $10.95
Add

UNi-PRO Trade 160mm Mico-Fibre Paint Tray Kit $16.95

Waterproofing Systems Built for Australian Conditions

Engineered to perform in the most demanding environments.

Pool Waterproofing System

Designed for permanent water immersion. Chlorine, salt & UV stable.

ACTFLEX 989 CWP High-Performance, Cementitious Membrane

ACTFLEX 989 CWP ACTFLEX 906 WPU Waterbase Polyurethane

ACTFLEX 906 ACTFLEX FLEXTAPE 120mm x 20m

ACTFLEX FLEXTAPE

1

Retaining Wall System

High performance negative pressure waterproofing for below ground structures.

ACTFLEX 989 CWP ACTFLEX SuperBond 007 PVC universal primer 1 litre

ACTFLEX SUPERBOND ACTFLEX MESHTAPE 120mm x 20m

ACTFLEX MESHTAPE

1

Tank Waterproofing System

Potable water safe. Ideal for concrete water tanks and reservoirs.

ACTFLEX 989 ACTFLEX 906 WPU Waterbase Polyurethane

ACTFLEX 906 ACTFLEX FLEXTAPE 120mm x 20m

ACTFLEX FLEXTAPE

1

System Build-Up Guide

Correct application makes all the difference.

View All Details

Pool System Build-Up

1 Concrete Substrate
2 Crack Repair (if required)
3 ACTFLEX FLEXPLUS
4 ACTFLEX HYDROPLUG
5 ACTFLEX AT MESH
6 ACTFLEX 988 CWP (2 Coats)
7 Tile Adhesive
8 Pool Finish

Retaining Wall System Build-Up

1 Concrete Substrate
2 Crack Repair (if required)
3 ACTFLEX MS PRO
4 ACTFLEX AT MESH
5 ACTFLEX 988 CWP (2 Coats)
6 Protection Board (Optional)
7 Drainage System
8 Backfill

Tank System Build-Up

1 Concrete Substrate
2 Crack Repair (if required)
3 ACTFLEX FLEXPLUS
4 ACTFLEX AT MESH
5 ACTFLEX 988 WMP (2 Coats)
6 Protective Coating (Optional)
7 Water

Technical overview

ACTFLEX 400 CLEAR is a clear, single-pack co-polymer emulsion with synthetic rubber latex, developed as a temporary leak-stopping solution for tiled areas. Applied directly over existing tiles, it forms a tough, flexible, UV-resistant waterproof barrier without the need for tile removal. Semi-gloss transparent finish providing up to five years of protection.

Colour	Transparent, semi-gloss
Solid Contents	45%
Density	~1.0–1.1 g/cm³
Tack Free Time	120 minutes @ 20°C
Recoat Time	4 hours @ 25°C, 50% RH
Elongation at Break	100%
Full Cure	72–120 hours @ 25°C, 50% RH
Waterproof Time	3 hours @ 25°C, 50% RH
Application Temperature	+10°C to +26°C
Recommended Thickness	0.2 mm over tiles, 0.5 mm over grout/joints
Coverage	3 m² per 1 kg depending on surface
Bond Strength	Bonds to most substrates; compatibility testing required
Chemical Resistance	Good
Available Sizes	1 kg / 3 kg / 7 kg
Shelf Life	12 months (sealed, cool/dry storage)

Key applications

Tiled balconies, courtyards & terraces
Wet areas including showers
Waterproofing of terracotta tiles & pavers
Top coating / sealing of timber floors
Sealing sandstone surfaces
Face brick walls

Surface suitability

Tiles
Timber
Pavers
Most masonry surfaces
Concrete
Terracotta
Bricks

Temporary leak-stopping solution (up to 5 years) — not guaranteed. Not a vapour barrier; does not stop hydrostatic or rising damp. Not for continuous ponding, vehicles, or chlorine-based environments. Apply between 10–26°C only.

Calculate your coverage

Enter area to cover (m²) m² Number of coats

You will need:

ACTFLEX 400 CLEAR Waterproofing Membrane

3kg Kit

0 Kits

Total coverage: 0 m²

This is an estimate only. Add 10% for wastage.

Technical Specifications

Colour	Transparent, semi-gloss
Solid Contents	45%
Density	~1.0–1.1 g/cm³
Tack Free Time	120 minutes @ 20°C
Recoat Time	4 hours @ 25°C, 50% RH
Elongation at Break	100%
Full Cure	72–120 hours @ 25°C, 50% RH
Waterproof Time	3 hours @ 25°C, 50% RH
Application Temperature	+10°C to +26°C
Recommended Thickness	0.2 mm over tiles, 0.5 mm over grout/joints
Coverage	3 m² per 1 kg depending on surface
Bond Strength	Bonds to most substrates; compatibility testing required
Chemical Resistance	Good
Available Sizes	1 kg / 3 kg / 7 kg
Shelf Life	12 months (sealed, cool/dry storage)

Downloads

Real Projects. Real Results.

View All Projects

Before After
Pool Renovation
Gold Coast, QLD
Before After
Below Ground Retaining Wall
Sydney, NSW
Before After
Concrete Water Tank
Perth, WA
Before After
Commercial Podium
Melbourne, VIC
Before After
Swimming Pool Construction
Brisbane, QLD

How to install

Watch the install

Step-by-step from prep to top coat. Filmed on the tools, not in a studio.

Why Choose

The Waterproofing Shop?

We supply premium waterproofing products backed by expert advice, fast service and real-world experience.

100% Australian
Owned & Operated

30+ Years in the
Waterproofing Industry

Thousands of Products
in Stock

Fast Shipping
Australia Wide

Expert Technical
Support

Frequently asked questions

View all FAQs

What is ACTFLEX 400 Clear used for?

Compatibility
400 Clear is a clear waterproofing membrane that applies directly over existing tiles, grout, and brick - eliminating the need to demolish and retile a leaking bathroom, shower, or balcony. Bonds to ceramic, porcelain, and most stone tiles.
How long does the waterproofing last?

Performance
ACTFLEX 400 Clear provides up to 5 years of UV-resistant waterproofing over existing tiles - a major service-life extension compared to repeated grout/silicone repairs. Maintains the original tile appearance with a semi-gloss finish.
How thick should I apply it?

Installation
Apply at 0.2mm DFT over tiles or 0.5mm DFT over exposed grout, in 2-3 coats. Coverage is 3 m² per kg. Touch-dry in 120 minutes at 20°C, recoat after 4 hours, waterproof in 3 hours, full cure 72-120 hours.
What surface prep is needed?

Compatibility
Clean the existing tiles thoroughly to remove all dirt, grease, mould, and loose grout. Repair any cracked tiles first. The 400 Clear chemistry depends on a clean sound substrate - skipping prep leads to bond failure.
Is this a permanent fix?

Compliance
400 Clear is a remedial system providing up to 5 years of protection. For new-build AS3740-compliant waterproofing, use the under-tile ACTFLEX 906 WPU or 929 system instead. 400 Clear is the right choice when tile removal isn't viable.

ACTFLEX 400 CLEAR Waterproofing Membrane

Frequently bought together

Pool Waterproofing System

Retaining Wall System

Tank Waterproofing System

Pool System Build-Up

Retaining Wall System Build-Up

Tank System Build-Up

Technical overview

Key applications

Surface suitability

Calculate your coverage

Technical Specifications

Downloads

Pool Renovation

Below Ground Retaining Wall

Concrete Water Tank

Commercial Podium

Swimming Pool Construction

The Waterproofing Shop?

Frequently asked questions

You may also need