HMK Stone Care
HMK® S741-10 Stone Hardener / Reinforcement Agent — 10 L
HMK® S741-10 Stone Hardener / Reinforcement Agent — 10 L
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HMK® S741-10 Stone Hardener / Reinforcement Agent — 10 L
Strengthen & Reinforce Weathered Stone for Lasting Durability
Key Benefits
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Deeply reinforces crumbled, friable or weathered stone and mineral substrates
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Maintains 100% vapor permeability (allows the stone to breathe) HMK Stone Care+2Moeller Stone Care+2
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UV resistant and preserves a natural, non-shiny finish HMK Stone Care+1
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Ideal for soft, absorbent stone types like sandstone, mortar, plaster, and other mineral or absorbent masonry surfaces Moeller Stone Care+2Prodistone+2
⚠️ Not recommended for dense stone types such as most marbles or dense limestones due to insufficient absorption Moeller Stone Care+1
Typical Applications
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Exterior walls, stone facades, carved or weathered stone surfaces
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Mortar joints, historic masonry, soft plaster overlays
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Areas where stone is beginning to disintegrate or lacks structural cohesion
Technical Details & Specifications
| Feature | Detail |
|---|---|
| Coverage | ~1 to 5 L per m² (depends on substrate porosity) Moeller Stone Care+2HMK Stone Care+2 |
| Container Size | 10 liter can (HMK® S741-10) HMK Stone Care+1 |
| Working Conditions | Substrate absorption ≥ 5%, stone thickness ≥ ¾ in, temperature between 40-75°F (≈ 5-25 °C) HMK Stone Care+1 |
| Cure Time | Protect from direct sun or rain ~1 week; full hardening ~2–3 weeks (some documents extend to 4 weeks) Moeller Stone Care+2HMK Stone Care+2 |
| Packaging Options | 10 L, also available in smaller sizes (5 L etc.) HMK Stone Care |
| Safety / Handling | Flammable (contains turpentine substitute). Use ventilation, avoid ignition sources. Avoid skin/eye contact. See SDS for full safety details. Moeller Stone Care+2HMK Stone Care+2 |
How to Use (Summary of Best Practice)
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Preparation
Remove all loose or delaminated stone particles and debris. The surface must be clean, dry, and stable. Loose fragments cannot be reattached by S741. Moeller Stone Care+1 -
Application
Apply with natural-bristle brush, sealing brush, roller, or low-pressure sprayer. Use wet-on-wet passes until saturation is achieved (several applications may be needed). HMK Stone Care+2Moeller Stone Care+2 -
Curing / Protection
Shield treated areas from rain, direct sunlight, or freezing for at least one week to allow polymerization into silica-based (SiO₃) bonds. HMK Stone Care+1 -
Optional Follow-up
After full cure, consider applying a silane or impregnator (e.g. HMK S31 or other HMK impregnators) to provide stain / water repellency (S741 does not provide hydrophobic sealing). HMK Stone Care+1 -
Retreatment
For severely degraded stone, a second application may be needed ~3 weeks later. Moeller Stone Care+1
⚠️ Always perform a test area to verify absorption, compatibility, and coverage before full-scale application.
Why Choose HMK® S741?
By integrating S741 into your restoration workflow, you strengthen fragile stone without altering its appearance or blocking vapor transmission. This product helps extend the life of weathered masonry, prevents further flaking, and stabilizes the substrate for future protection or sealing steps.