Funcosil SL is a premium solvent-based silane/siloxane treatment designed for deep-penetrating protection of sandstone, limestone, lime renders, and other mineral substrates. Ideal for conservation, historic restoration, and traditional build projects, Funcosil SL offers long-lasting resistance to water ingress while fully maintaining breathability.
Key Benefits
-
Effective water repellency prevents driving rain, surface moisture, and frost damage
-
High vapour permeability allows walls to breathe, avoiding trapped moisture
-
Deep penetration due to low molecular formulation; cures to a durable polysiloxane
-
UV- and alkali-resistant, designed for long-term exposure durability
-
Reduces staining & algae growth, while enhancing frost and salt resistance
-
Invisible and breathable finish, with no surface film or sheen
Recommended Applications
-
Historic sandstone, limestone, and lime-render facades
-
Porous mineral brickwork and natural stone
-
Old masonry exposed to rain, frost, or atmospheric salts
-
Conservation and heritage projects where breathability is essential
Not suitable for non-porous substrates like polished marble or solvent-sensitive materials such as polystyrene.
Application Guidelines
-
Surface preparation: Clean and dry; remove salts, biofilms, and dust
-
Application conditions: Between +10 °C to +25 °C, avoid rain during curing
-
Method: Apply 2+ wet-on-wet coats, using flow coating or well-saturated brush/sprayer
-
Coverage:
-
Fine‑pored stone: 0.2–0.5 L/m²
-
Coarse‑pored stone: 0.4–1.5 L/m²
-
-
Protect adjacent surfaces and remove excess within 1 hour if needed
