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CLEAR MEMBRANE Forspec ACTFLEX 400 Clear UV-resistant clear waterproofing membrane for tiled and masonry surfaces

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ACTFLEX 400 CLEAR Waterproofing Membrane

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.

Goes straight over existing tiles

Waterproof in 3 hours

Dries clear and semi-gloss

$66.00

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or 4 interest-free payments of $16.50 with · ex GST $60.00

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Choose your size 1 Kg

? Coverage is about 3 m2 per kg per coat. Dilute the first coat 50% with water. Not sure? Use the coverage calculator below.

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☎ Not sure which size you need?
Call (02) 8021 3517 before you order

Waterproof in 3 hours

Goes over existing tiles

Dries clear, semi-gloss

Trade product support

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 Membrane - 1 Kg

$66.00 · In stock · Coverage about 3 m2 per kg per coat.

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Complete your repair kit

Prep, applicators and sealants that pair with ACTFLEX 400 Clear. Tick what you need and add them in one go.

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See the fix

Drag the handle to reveal the same surface once it is sealed.

BeforeAfter

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Waterproof in 3 hrsOver existing tilesClear finish

Where can it be used?

Leaking balconies

Seal over the tiles

Tiled bathrooms

Showers & wet areas

Roof tiles

Over existing roof tiles

Concrete roofs

Flat & pitched concrete

Rendered walls

Clear breathable barrier

Parapet walls

Tops & upstands

Retaining walls

Face-side protection

External stairs

Trafficable & sealed

Podiums

Walkway decks

Terraces

Tiled outdoor terraces

How it works

Clean, dry, roll on. Six simple steps from leaking to sealed.

1

Pressure clean

Blast off dirt, grime and anything loose from the surface.

2

Allow surface to dry

Let it fully dry before you start - no moisture on top.

3

Roll on first coat

Dilute 50% with water and roll an even first coat to key in.

4

Wait 4 hours

Let the first coat cure before you recoat.

5

Roll second coat

Apply an even, undiluted second coat.

6

Roll final coat

Finish with a third coat for a full clear barrier.

!Leak stopped. No demolition, no removing tiles, no expensive repairs.

iRun the integrated dust extraction the whole time and wear a P2 respirator, eye and hearing protection. Follow your site WHS requirements.

Why contractors love it

No demolition

No primer

Clear finish

UV resistant

Waterproof

Roll-on application

Brush application

Stops leaks fast

Suitable over tiles

Built for Australian conditions

Real customer reviews

How much do you need?

ACTFLEX 400 seals roughly 3 m2 per kg per coat. Enter your area and coats and we will size the packs and the diluted first coat.

Area to seal 20 m2

Number of coats

Surface

Product needed

0 kg

for 20 m² at 3 coats

First coat mix

50% water

~0 kg + 0 L water

Recommended packs

Estimate only. Coverage varies with surface porosity and film thickness. Allow extra for grout lines and corners.

Detailed instructions

Surface preparation

The surface must be clean, dry and structurally sound. Pressure clean to remove dirt, grime and loose material. Remove old silicone from corners and around penetrations. Fill any cracks and re-seal corners and missing grout with a clear MS sealant before you coat.
Application

Dilute the first coat 50% with water so it keys into the surface, then apply 2 to 3 thin, even coats by brush or roller. Keep coats thin rather than thick - thin coats cure evenly and stay clear.
Dry & recoat times

Touch dry in roughly 60 to 120 minutes depending on temperature. Leave at least 4 hours between coats. Waterproof in about 3 hours at 25°C and 50% humidity.
Weather & conditions

Apply between +10°C and +26°C. Do not apply if rain is expected within 24 hours. Keep the surface free of standing water and ponding while it cures.
Coverage

Around 3 m² per kg per coat, surface dependent. As a guide 1KG seals ~3 m², 3KG ~9 m² and 7KG ~21 m² per coat. Use the coverage calculator above to size it for your job.
Cleaning up

Clean tools and any spills with water while the product is still wet. Once cured it is water resistant and much harder to remove.
Storage

Store sealed and out of direct sun between +5°C and +30°C. Shelf life is around 12 months sealed. Reseal the container tightly between coats.
Maintenance

Inspect annually and after major storms. Re-coat high-wear or high-traffic areas as needed to keep the barrier intact.