Protect and stabilise porous natural stone with Crommelin Limestone Sealer 15L, a specialised water‑based treatment that enhances limestone and sandstone surfaces without hiding their natural character. Unlike film‑forming sealers, this hydrophobic binder soaks into the stone to make soft, friable material harder and dust‑free while still allowing it to breathe naturally.

Whether you’re maintaining heritage walls or preparing ornamental stonework for long‑term exposure, this sealer delivers water repellency and biocide protection, helping to reduce mould and algae growth over time.

Key Features:

• Clear, water‑based treatment that preserves the natural look and texture of limestone and sandstone.

• Hydrophobic binder penetrates deep to repel water while allowing the substrate to breathe.

• Binds loose and friable surfaces, converting soft stone to a harder, dust‑free finish.

• Biocide‑enhanced formula inhibits mould, algae and lichen growth.

• UV stable finish resists long‑term weathering without yellowing or discolouring.

• Clear matt to low‑sheen surface for a natural, uncoated appearance.

Ideal For:

• Natural limestone and sandstone walls or cladding.

• Ornamental features and architectural stonework.

• Vertical stone surfaces that need water repellency and resistance to biological growth.

Application & Benefits:
Start by ensuring the stone surface is clean and dry. Then apply the sealer evenly with a brush, roller or low‑pressure spray so it penetrates into the pore structure. As it dries, this treatment helps reduce water ingress and supports surface durability without changing colour or texture. Because it’s water‑based with very low VOCs, cleanup is simple and indoor air quality isn’t compromised. Always follow the manufacturer’s instructions and test on a small area first.