Jove Leonard
If you’ve recently installed beautiful sandstone in your yard, garden path, or patio, congrats! Sandstone is one of the most elegant natural stone materials out there. But if you want it to last for years and look as stunning as it did on day one, sealing it the right way is crucial. Let’s dive into the step-by-step process of how to properly seal sandstone after installation—and trust me, it’s easier than you think!
Why Sealing Sandstone Matters
Let’s be real. Sandstone is gorgeous but also porous, which means it can absorb moisture, oils, and stains like a sponge. If left unsealed, your stone could quickly lose its charm due to discoloration, weathering, or even mold and algae.
Sealing helps:
- Repel water and moisture
- Prevent oil and food stains
- Reduce growth of moss and mildew
- Enhance the color and texture
- Extend the stone’s lifespan
This is especially important for outdoor installations exposed to rain, sunlight, and dirt.
For more basics on sandstone properties, visit Sandstone Basics.
When Should You Seal Sandstone?
New Installation vs. Existing Sandstone
Ideally, sandstone should be sealed right after installation—but only once the mortar or grout has fully cured and the stone is clean and dry.
For existing sandstone surfaces, you’ll want to strip away any old sealer or deep-clean the stone before applying a fresh layer. Also, sealing after deep cleaning or restoration (especially for older patios or walkways) can revive the stone’s natural look.
What You’ll Need Before You Start
Essential Tools & Materials
Here’s a quick checklist:
- Stone cleaner or degreaser
- Stiff-bristle brush or mop
- Water source or hose
- Microfiber cloths
- Paint tray or bucket
- High-quality sandstone sealer
- Paint roller or sprayer
- Safety gloves and mask
Choosing the Right Sealant for Sandstone
Not all sealers are created equal. The best sealer depends on how you want your sandstone to look and where it’s located.
Water-Based vs. Solvent-Based Sealers
- Water-based sealers are eco-friendly and easier to clean.
- Solvent-based sealers penetrate deeper and may offer a longer lifespan.
Enhancing Sealers vs. Natural Look Sealers
- Enhancing sealers deepen the stone’s natural colors and add a slight sheen.
- Natural-look sealers preserve the raw, matte appearance of sandstone.
Explore options on Sandstone Maintenance for detailed care guidance.
9 Steps to Properly Seal Sandstone
Alright, let’s break down the actual sealing process step by step.
Step 1: Clean the Surface Thoroughly
Before you do anything else, give your sandstone a deep clean. Remove dirt, algae, or any stains using a sandstone-specific cleaner. A stiff brush works wonders for textured surfaces.
Tip: Avoid acid-based cleaners—they can damage the stone.
Step 2: Allow Sandstone to Fully Dry
This is super important! Your stone needs to be bone dry before sealing. Trapped moisture can cause cloudiness, improper bonding, or mold later on.
Depending on the weather, drying can take 24–48 hours.
Step 3: Test a Small Area First
Choose a corner or hidden section to do a patch test. This shows you how the sealant will interact with your specific stone—especially if it’s colored or textured.
Don’t skip this step unless you like surprises!
Step 4: Apply First Coat Evenly
Use a sprayer or roller for even application. Go with thin layers and make sure the sealer gets into all the pores and crevices. Avoid puddles and dripping.
Pro Tip: Start from the furthest point and work your way back to avoid stepping on wet areas.
Step 5: Let the First Coat Cure
Follow the manufacturer’s instructions, but generally, allow the first coat to dry for at least 2–4 hours. Don’t rush this. Let it settle into the stone.
Step 6: Apply a Second Coat (If Needed)
Depending on the porosity of your sandstone and the look you want, a second coat may be necessary. This enhances protection and gives a richer finish.
Some stones are thirstier than others!
Step 7: Check for Missed Spots
Once everything is dry, inspect the surface. Use a flashlight at an angle to catch any areas that were missed. Reapply as needed.
Step 8: Final Cure Time
Once all coats are applied, let the surface cure for 24–72 hours. No foot traffic, rain, or cleaning during this time.
The result? A sealed, protected sandstone surface ready to stand the test of time.
Step 9: Perform Regular Maintenance
Even sealed sandstone needs some love. Clean it regularly, reseal every 2–3 years, and avoid harsh chemicals.
Need ideas for long-term sandstone upkeep? Check out our Sandstone Maintenance Guide.
Common Mistakes to Avoid When Sealing Sandstone
- Sealing wet or damp stone
- Using the wrong type of sealer
- Applying thick, uneven coats
- Not testing a small area first
- Forgetting to clean the stone first
Trust us, skipping steps now will cost you later.
How Long Does Sealed Sandstone Last?
A good sealer can protect your stone for up to 3 years (sometimes longer with indoor installations). High-traffic or outdoor areas may need resealing sooner.
Want to reduce wear and tear? Consider Pavers & Flagstone for durable sandstone arrangements that resist erosion.
Benefits of Sealing Sandstone Correctly
When done right, sealing sandstone:
- Preserves its natural color
- Increases resistance to stains
- Slows down wear from foot traffic and weather
- Adds a professional, polished finish
- Boosts the value of your outdoor space
Need inspiration for your outdoor project? Browse Sandstone Design Ideas.
Where to Get Quality Sandstone & Sealing Advice
Looking for high-quality sandstone or expert sealing products? Southern Stoneworks has you covered. Explore our full range of products including:
Visit Southern Stoneworks to get started today!
Final Thoughts
Properly sealing your sandstone is a crucial step that’s often overlooked. But once you get it done, you’ll see (and feel) the difference instantly. Cleaner lines, bolder colors, and protection from nature’s worst—it’s all worth it.
Just follow these 9 simple steps and your sandstone will stay gorgeous for years. You’ve made an investment in beauty. Now protect it like it deserves.
FAQs
❓ How do I know when my sandstone needs resealing?
Look for dark spots from water absorption, dull color, or areas where dirt and moss build up quickly.
❓ Can I use the same sealer indoors and outdoors?
Some sealers work for both, but check the label. Outdoor sealers usually offer better UV and water resistance.
❓ Is it okay to pressure wash sealed sandstone?
Yes—but use a low-pressure setting and keep the nozzle a few feet away to avoid damaging the surface or stripping the sealer.
❓ Can I walk on the sandstone right after sealing?
Nope! Let it cure for 24–72 hours depending on the sealer used. Keep pets off it too!
❓ Will sealing sandstone change its color?
Depends on the type of sealer. Enhancing sealers will deepen the tone, while natural-look sealers preserve the original appearance.
❓ Can I seal sandstone myself or should I hire a pro?
Totally doable as a DIY project if you follow the steps above. But for large or complex areas, hiring a pro might be a good move.
❓ What happens if I skip sealing altogether?
Unsealed sandstone can absorb stains, grow mold, and deteriorate faster—especially in wet or sunny climates.