Actichem Pre-Seal — sold by Actichem as Preseal Pro, product code AP171 — is a premium penetrating pre-sealer applied to stone, masonry and cement products before and during installation. This is the 15 litre pack for fabricators and large installations. The same product is available as a 5 litre pack, and that page carries the full application guide.
The 15 litre pack is ordered in on request, so allow extra lead time.
What it does
Pre-Seal is formulated to dramatically inhibit the ingress of moisture into construction and fine stone, masonry and cement products during the installation process. It does this without compromising adhesive bond strength, while helping prevent tile warp and other installation defects. It is cost-effective and works in conjunction with the rest of the Actichem penetrating sealer range.
Benefits
- Easy application — penetrates quickly and is easy to apply.
- Retains newness — protects against staining and water absorption during fabrication, transport and installation.
- Protects — enables easier removal of grout smear, helps prevent “framing” caused by grout moisture ingress, and helps prevent construction and installation stains.
- Vapour permeable — will not trap moisture and does not hinder the natural passage of water vapour.
- Prevents installation defects — significantly inhibits tile warping.
Safety information — please read before ordering
Actichem's current safety data sheet (version 2.2, issued 15 July 2025) classifies Pre-Seal as DANGER.
- H318 — Causes serious eye damage (Category 1).
- H315 — Causes skin irritation.
- pH 10.5 as supplied. Contains potassium methylsiliconate (<5%) and isopropanol (<10%).
- Poisons Schedule: not applicable. Not regulated for transport of dangerous goods.
Wear chemical goggles and gloves, keep an eyewash within reach, and maintain adequate ventilation at all times, particularly when dip-sealing. The isopropanol flashing off during cure is flammable: no hot work, smoking or grinding sparks near a freshly treated batch or an open dip tank.
Recommended applications
- Marble, limestone and travertine
- Sandstone, granite, basalt and bluestone
- Cement and clay pavers
- Terracotta, Saltillo and quarry tile
Preparation
- The material surface must be totally clean, dry and chemical free.
- Do not apply in direct sunlight. Apply at temperatures between 10 °C and 28 °C.
- Coverage is 5 to 20 m² per litre per coat. At that rate a 15 litre pack treats roughly 75 to 300 m² in one coat, depending on porosity.
Directions
- Apply one coat by generously saturating the surface using a polish applicator, roller or sprayer. Ensure even coverage. Dip-sealing is also an approved method for six-sided sealing.
- The surface must be shiny wet with a liquid film for at least 30 seconds. Very porous substrates may need more sealer.
- Allow 5 to 10 minutes for the sealer to absorb, then remove the excess with a clean dry towel.
- Ten minutes after the last application, wipe off any sealer remaining on the surface with absorbent towelling or an applicator. Moisten the towel with methylated spirits to remove residues that have dried on the surface — in a ventilated area, away from ignition sources.
- Allow 24 hours before fabrication or installation. Keep dry for 12 hours. Full cure in 24 to 48 hours.
Specifications
| Product code | AP171 |
|---|---|
| SKU | AP171.15 |
| Pack size | 15 litres |
| Type | Penetrating pre-sealer for natural stone and porous tile |
| pH as supplied | 10.5 |
| Dilution | Ready to use |
| Coverage | 5 – 20 m² per litre per coat |
| Application temperature | 10 – 28 °C, not in direct sunlight |
| Signal word | DANGER (H315, H318) |
| Dangerous goods | Not regulated for transport |
Frequently asked questions
5 litre or 15 litre?
Estimate from a test area on the actual material, because coverage runs from 5 to 20 m² per litre. For a single bathroom or a small paving job the 5 litre pack is enough. For a fabrication run, a dip tank or a whole house of stone, the 15 litre pack is the practical size.
Will pre-sealing stop my tiles bonding?
No. It is a penetrating treatment, not a film former, and is formulated so adhesive bond strength is not compromised.
Do I still need to seal after installation?
Yes. Pre-Seal protects the material through the build. A finish sealer such as Actichem Stone Sealer Pro provides the long-term stain repellency once the floor is laid, clean and cured.
Safety Data Sheet
Actichem Preseal Pro Safety Data Sheet — version 2.2, issued 15 July 2025
Planning a stone installation and not sure whether to pre-seal, dip-seal or seal only on completion? Contact Carpet Cleaners Warehouse before you order. The decision has to be made before the material is laid.
