Stop rain soaking into your walls with an invisible, breathable barrier in one coat. HydroLock is a deep-penetrating silane–siloxane cream that waterproofs brick, stone and render, and it dries completely clear. Made in the UK.
✓ One coat✓ Dries clear✓ Breathable✓ Keeps walls warmer✓ Made in UK
Why customers choose it
- ✔️ Deep-penetrating waterproofing: a long-lasting water-repellent barrier against damp, driving rain and frost damage
- ✔️ Invisible finish: goes on white, dries crystal clear and keeps the natural look of your masonry
- ✔️ Breathable: lets walls breathe naturally, so moisture isn't trapped inside
- ✔️ Warmer, drier walls: dry masonry helps reduce heat loss and can lower energy bills
- ✔️ Long-term protection: resists efflorescence, algae and moss
- ✔️ Water-based & low VOC: low odour and safe to use around the home
Suitable surfaces
- Brickwork
- Stone
- Render
- Concrete
- Block
- Limestone
- Porous mineral surfaces
- New builds & heritage homes
How much do I need?
-
Coverage: up to 5m² per litre in one coat
- Very porous or rough brickwork uses more product
| Size |
Covers |
Ideal for |
Price per litre |
| 1 Litre |
up to 5m² |
Test patch, porch or chimney |
£29.99/L |
| 2.5 Litre |
up to 12.5m² |
Small wall or bay |
£24.00/L |
| 5 Litre |
up to 25m² |
One side of a house |
£18.00/L |
| 20 Litre |
up to 100m² |
Whole house or trade |
£15.00/L |
Best value: the 5L and 20L sizes cost up to half as much per litre as the 1L
How to apply in 3 steps
-
Prepare: make sure the wall is clean, dry and free from moss, algae and loose material.
-
Apply: one coat with a brush, roller or low-pressure sprayer. It goes on white so you can see where you've covered.
-
Dry: leave it to soak in. It dries to a clear, invisible finish.
Frequently asked questions
Will it change the look of my brickwork?+
No. It goes on white so you can see where you've applied it, then dries completely clear with no sheen or discolouration.
How many coats do I need?+
Usually just one coat is enough to give full water repellency.
How long does it protect for?+
It's a long-term treatment, and the tin label states 25-year damp and water protection.
Will my walls still breathe?+
Yes. It's a breathable silane–siloxane cream, so moisture vapour can escape and damp isn't trapped inside the wall.
Can I paint over it?+
It's designed as a clear invisible finish. If you plan to paint, do it before treating the wall.
What surfaces can I use it on?+
Brick, stone, render, concrete, block, limestone and other porous mineral surfaces.
Does it really save energy?+
Dry walls hold heat better than wet ones, so treating porous masonry helps keep homes warmer and can reduce heat loss.
Is it safe to use around the home?+
Yes. It's water-based and low VOC, with low odour.
How fast is delivery?+
Free next-day UK delivery on orders placed before the daily cut-off.
