5 Common Mistakes with Sandstone
5 Common Mistakes with Sandstone
Sandstone is the most porous of all natural stones. Without proper care, stains become permanent within hours. Most mistakes stem from underestimating how quickly sandstone absorbs liquids.
Mistake #1
Not sealing before first use
Why this is a problem
Unsealed sandstone absorbs everything - water, oil, wine, even sunscreen from bare feet. Once absorbed, stains sit deep inside the grain structure where no surface cleaner can reach.
How to fix it
For oil stains, try Lithofin MN Stain-Stop as a poultice. For general discolouration, deep clean with Lithofin MN Power-Clean, then seal immediately.
Prevention
Seal sandstone before it's ever walked on or exposed to weather. Apply Lithofin MN Stain-Stop in two coats for maximum protection.
Mistake #2
Pressure washing at full strength
Why this is a problem
Sandstone grains are held together by natural cement. High-pressure washing blasts away this cement, roughening the surface, opening pores wider, and accelerating weathering.
How to fix it
The damage is permanent - roughened sandstone can't be smoothed easily. Re-seal the roughened surface to prevent further degradation.
Prevention
Use maximum 60 bar pressure with a wide fan nozzle, held at least 30 cm from the surface. Better yet, use Lithofin MN Outdoor-Clean and a stiff brush.
Mistake #3
Using acid-based patio cleaners
Why this is a problem
Many patio cleaners contain hydrochloric acid (muriatic acid). This dissolves the calcite cement between sandstone grains, causing the surface to crumble and become powdery within weeks.
How to fix it
No reversal possible for acid-damaged sandstone. Seal the affected area to slow further deterioration.
Prevention
Use only pH-neutral or mildly alkaline cleaners. Lithofin MN Outdoor-Clean is specifically formulated for natural stone patios.
Mistake #4
Placing plant pots directly on sandstone
Why this is a problem
Water drains through the pot onto the stone. Tannic acid from soil and minerals in plant water create dark rings that penetrate deep into porous sandstone.
How to fix it
Lithofin MN Power-Clean can lighten these stains. Deep rings may need a poultice treatment left overnight.
Prevention
Always use saucers under pots, or elevate pots on feet. Seal the sandstone beneath planters with an extra coat.
Mistake #5
Applying sealer when the stone is damp
Why this is a problem
Sealant needs to penetrate into dry pores. If the stone contains moisture, the sealer sits on top, creating a white haze or flaking film instead of bonding with the stone.
How to fix it
Strip failed sealer with Lithofin MN Power-Clean. Let the stone dry for at least 48 hours (72 hours outdoors), then re-apply.
Prevention
Test with a moisture meter or tape test: tape clear plastic to the surface for 24 hours - if condensation forms underneath, the stone is too wet.
Need help with Sandstone?
Use the LithoFinder wizard to find the right product for your sandstone surface, or read the full Sandstone care guide.