Densify and seal soft stone and concrete
Stain-Proof 40SK Densifier + Sealer
- Regular price
- $333.18
- Fast, tracked shipping
- Prices in CAD
Stain-Proof 40SK is a deep-saturating consolidator (densifier) and water repellent that hardens softer materials like concrete, limestone and sandstone while protecting them from water, salts, efflorescence and freeze-thaw spalling. It is invisible and breathable, making it a strong choice for Canadian driveways, pool surrounds and coastal properties exposed to de-icing salt or sea air.
- Densifier + water repellent
- Invisible finish
- Salt + freeze-thaw rated
- 1 Gal / 5 Gal
Key benefits
Why choose Stain-Proof 40SK Densifier + Sealer
-
Densifies as it seals
Densifies (consolidates) soft stone and concrete as it seals
-
Permanent water repellent
Permanent, invisible water repellent
-
Stops salt and freeze-thaw spalling
Protects against efflorescence, salt spalling and freeze-thaw spalling
-
Resists cleaning chemicals
Protects stone from harsh annual pressure washing chemicals
-
Breathable
Breathable, so trapped moisture cannot freeze inside the material
-
15-year warranty option
15-year warranty when installed by a Stain-Proof Accredited Applicator
At a glance
Specifications
| Type | Consolidator (densifier) and water repellent |
|---|---|
| Base | Solvent |
| Finish | Invisible |
| Surfaces | Concrete, roof tiles, cast stone, paving, sandstone, limestone, travertine, brick, grout, terracotta |
| Use | Interior and exterior; use respiratory protection indoors |
| Sizes | 1 Gal, 5 Gal |
| Lead time | 3-7 business days handling |
Works on
- Concrete
- Roof tiles
- Cast stone
- Paving
- Sandstone
- Limestone
- Travertine
- Brick
- Grout
- Terracotta
How to use
Step-by-step application
-
Clean and dry
Clean the surface and allow it to dry fully.
-
Test an area
Test a small area.
-
Saturate evenly
Apply evenly so the surface is saturated.
-
Remove excess
Remove any excess from the surface.
-
Dry and ventilate
Allow to dry as directed on the label; ventilate and use respiratory protection indoors.
Compare
How Stain-Proof 40SK Densifier + Sealer compares
Side-by-side with alternatives from our catalogue.
| Feature | 40SK Densifier + Sealer | Premium Impregnating | Premium Waterborne | Waterbased |
|---|---|---|---|---|
| Base | Solvent | Solvent | Water | Water |
| Finish | Invisible | Natural, invisible | Invisible | Invisible |
| Best for | Soft stone and concrete exposed to salt, freeze-thaw, pools, ocean air | Most natural stone, tile, pavers, concrete, grout; countertops | Interior and exterior stone and masonry; water-based option | Cost-effective DIY sealing of stone and concrete |
Swipe the table sideways to compare.
Full product details
Stain-Proof 40SK is a deep-saturating consolidator (densifier) and water repellent that hardens softer materials like concrete, limestone and sandstone while protecting them from water, salts, efflorescence and freeze-thaw spalling. It is invisible and breathable, making it a strong choice for Canadian driveways, pool surrounds and coastal properties exposed to de-icing salt or sea air.
Key benefits of 40SK Densifier + Sealer
- Densifies (consolidates) soft stone and concrete as it seals
- Permanent, invisible water repellent
- Protects against efflorescence, salt spalling and freeze-thaw spalling
- Protects stone from harsh annual pressure washing chemicals
- Breathable, so trapped moisture cannot freeze inside the material
- 15-year warranty when installed by a Stain-Proof Accredited Applicator
40SK Densifier + Sealer specifications
| Specification | Detail |
|---|---|
| Type | Consolidator (densifier) and water repellent |
| Base | Solvent |
| Finish | Invisible |
| Surfaces | Concrete, roof tiles, cast stone, paving, sandstone, limestone, travertine, brick, grout, terracotta |
| Use | Interior and exterior; use respiratory protection indoors |
| Sizes | 1 Gal, 5 Gal |
| Lead time | 3-7 business days handling |
Who it is for
- Driveways and walkways treated with road salt
- Salt-water pool surrounds and oceanfront properties
- Limestone, sandstone and travertine outdoors
- Dry-stamped and composite stone pavers
How to use 40SK Densifier + Sealer
- Clean the surface and allow it to dry fully.
- Test a small area.
- Apply evenly so the surface is saturated.
- Remove any excess from the surface.
- Allow to dry as directed on the label; ventilate and use respiratory protection indoors.
Using 40SK Densifier + Sealer in the Canadian climate
40SK is the Stain-Proof product specified for salt and freeze-thaw exposure. Water-borne salts from de-icers and sea air drive spalling and efflorescence; 40SK repels water while staying breathable.
40SK Densifier + Sealer compared
| Sealer | Base | Finish | Best for |
|---|---|---|---|
| Premium Impregnating | Solvent | Natural, invisible | Most natural stone, tile, pavers, concrete, grout; countertops |
| Dense Stone | Solvent | Invisible, natural look | Granite, marble, quartzite and other dense stone |
| Colour Enhancing | Solvent | Deep colour enhancement | Stone, terracotta, brick, concrete where a richer colour is wanted |
| 40SK Densifier + Sealer | Solvent | Invisible | Soft stone and concrete exposed to salt, freeze-thaw, pools, ocean air |
| Premium Waterborne | Water | Invisible | Interior and exterior stone and masonry; water-based option |
| Waterbased | Water | Invisible | Cost-effective DIY sealing of stone and concrete |
| Paver Enhancing | Solvent | Colour enhanced, no sheen | Concrete pavers, cement tile, terrazzo |
40SK Densifier + Sealer FAQ
What does a concrete densifier do?
It penetrates and consolidates the pores of concrete or soft stone, making the surface denser and more resistant to water and salts.
Is 40SK visible after application?
No. It retains the natural colour and finish.
Can I use 40SK with another Stain-Proof sealer?
Stain-Proof recommends 40SK for extra protection of soft stone under Premium Impregnating Sealer in freeze-thaw or salt-water settings.
Can I use it indoors?
Yes, with proper respiratory protection.
Do you offer bulk pricing?
Yes, contact us for pricing on 5 gallons or more.
Use with
- Prep: EffBOMB Efflorescence Remover
- Then seal: Stain-Proof Premium Impregnating Sealer
- Water-based alternative: Trident Break Wall
- Browse Paver and Concrete Sealers
StoneSealer Canada ships across Canada from British Columbia, priced in CAD. Contractor and volume pricing is available to account holders: email sales@stonesealer.ca. StoneSealer Canada is an authorized Canadian reseller of Stain-Proof (DryTreat / ICP Construction) sealers and cleaners and is not otherwise affiliated with the manufacturer. Published prices reflect minimum advertised price or above.
FAQ
Frequently asked questions
Still unsure which product fits your surface? Our team answers product and application questions.
Ask our teamWhat does a concrete densifier do?
It penetrates and consolidates the pores of concrete or soft stone, making the surface denser and more resistant to water and salts.
Is 40SK visible after application?
No. It retains the natural colour and finish.
Can I use 40SK with another Stain-Proof sealer?
Stain-Proof recommends 40SK for extra protection of soft stone under Premium Impregnating Sealer in freeze-thaw or salt-water settings.
Can I use it indoors?
Yes, with proper respiratory protection.
Do you offer bulk pricing?
Yes, contact us for pricing on 5 gallons or more.
