Last Updated on October 20, 2026 by Umar Farooq
Sealing paver joints means flooding a joint-stabilizing sealer over pavers that have been filled with ordinary joint sand. The sealer soaks into the sand and binds the top of the joint while it coats the paver surface in the same pass. It's a "sand and seal" job, and it's the method behind products like Seal-N-Lock and SEK Surebond's SB-1300. It works best on new or freshly re-sanded joints up to about 3/4 inch wide, filled with clean ASTM C144 sand. It has to be renewed with the sealer every few years. If you don't also want the pavers sealed, polymeric sand is the simpler way to harden joints, because its binder runs the full depth and needs no recoating. The sand on pavers after sealing guide covers this in more depth. If this applies to your yard, our guide to sticky paver sealer goes into more detail.
I read the data sheets for both approaches because they get muddled online. People ask whether to seal "over" polymeric sand, whether sealer "replaces" it, or whether sealing stops weeds. The short version: they're two different ways of putting a binder into a joint, and you normally choose one.
How a joint-stabilizing sealer works
A standard paver sealer is sprayed thin and back-rolled so it sits on the surface. A joint-stabilizing sealer is applied heavily enough to run into the joints and soak down into the sand, where the polymer glues the grains together as it dries.
SEK's SB-1300 data sheet spells out the conditions. It's a water-based acrylic co-polymer, and it asks for:
- Joints no wider than 3/4 inch, filled with ASTM C144 joint sand and vibrated in with a compactor or roller.
- Sand level at the bottom of the chamfer, or 1/8 inch below the top on square-edged pavers.
- Old joint sand removed to at least 1 inch on existing patios before re-sanding.
- A dry surface. Wait at least 24 hours after cleaning or rain, apply between 40°F and 95°F, and keep the surface below 120°F.
- Coverage of 80 to 120 sq ft per gallon when stabilizing joints, against 150 to 250 when only sealing. The joints drink the difference.
Seal-N-Lock's PRO Natural 1K works the same way. It's diluted 1:1 with water, applied first as a flood coat "to penetrate and stabilize properly prepared joints," and then up to four finish coats go on once each is dry to the touch. It needs 50°F minimum. Feet can go on after 12 hours and cars after 48.
Sealing paver joints, step by step
The sequence below follows the SEK and Seal-N-Lock instructions. Check the product you buy, since dilution and coat counts differ.
- Clean the pavers thoroughly and deal with efflorescence first. Sealing locks in whatever is on the surface.
- Let everything dry for 24 hours or more. Wet sand won't absorb the sealer.
- Sweep in clean joint sand and vibrate it. Top up until the joints stay full to the chamfer.
- Blow the surface clean so no loose sand is left on the faces.
- Flood coat. Spray liberally, then use a foam squeegee to push the excess into the joints. Back-roll any puddles on uneven pavers.
- Let it dry to the touch (SEK says about 60 minutes at 65 to 85°F), then add any light finish coat the label allows.
- Keep traffic off for the label time: 24 hours for SB-1300, and 12 hours for feet or 48 for cars with PRO Natural 1K.
The most common mistake is too little sealer. A normal spray-and-roll coat barely wets the sand, so the joint crusts over and loose sand sits underneath. The other mistake is too much. SEK warns that excessive coats can reduce breathability and make the surface slippery.
Joint-stabilizing sealer vs polymeric sand
| Joint sand + stabilizing sealer | Polymeric sand | |
|---|---|---|
| Where the binder goes | soaks into the upper joint; film on pavers | mixed through the full joint depth |
| Joint width | up to about 3/4 in (SB-1300) | 1/8 in to 4 in, by product |
| Paver surface | sealed in the same job | unsealed |
| Upkeep | reseal every 2–3 years (SEK's figure for SB-1300) | little; Alliance estimates about 15 years |
| Weather window | dry surface, 40–95°F (SB-1300) | dry surface, 12–24 h without rain for most |
| Haze risk | milky sealer if applied damp | haze from dust left on the faces |
Here's my take. If you want the pavers sealed anyway, for color or stain resistance, sand-and-seal is a sensible two-for-one: one product, one weekend, joints and surface done together. If you don't want a sealer on the pavers, don't use one just to harden the joints. You'd be signing up to reseal every two to three years to keep joints that polymeric sand would hold for years with no film on the surface. That's what polymeric sand is for, covered step by step in how to apply polymeric sand.
Sealing over polymeric sand
You can seal pavers that already have polymeric sand. You just aren't stabilizing the joints any further, because they're already bound. Two rules from the data sheets:
- Wait for the joint to cure. Techniseal's natural-look sealer asks for 30 days after polymeric sand. Techniseal's HP NextGel sheet says 7 to 30 days, Dominator says 14. Seal too early and you trap moisture.
- Use a normal spray-and-roll coat, not a flood coat. Flooding sealer into cured polymeric joints only puts more film on the surface.
Choosing the sealer itself (finish, chemistry, brand) is covered in our paver sealer buying guide. The full sealing process, from cleaning to recoat timing, is in paver sealing.
Does sealing the joints stop weeds?
It slows them. A bound joint is harder for seeds to root in and harder for ants to dig through, and SB-1300 adds an antifungal to its film for moss and algae. But weeds mostly grow in dirt and debris that settles on top of the joint, and no sealer stops that. Sweeping and rinsing still do most of the work.
Sand and seal only when you want the sealer too
Sealing paver joints with a stabilizing sealer is a good method with a narrow brief. It suits clean, dry joints up to about 3/4 inch, filled with proper joint sand, on a patio you want sealed anyway. Flood it, squeegee it into the joints, and plan to reseal every few years. If you only want hard joints, polymeric sand does it once and doesn't ask you back. Either way, dry sand is the part you can't skip. Wet joints turn a flood coat into a very expensive puddle.
FAQ
Can you seal paver joints with regular sand?
Yes. That's exactly what joint-stabilizing sealers are for. Fill the joints with ASTM C144 joint sand, vibrate it in, let everything dry, then flood the sealer over the surface so it soaks into the sand and binds it.
Is Seal-N-Lock better than polymeric sand?
Not better, different. Seal-N-Lock stabilizes joint sand and seals the paver surface in one job, but it needs recoating over time. Polymeric sand hardens the full joint depth and leaves the pavers unsealed. Choose sand-and-seal if you want the pavers sealed. Otherwise polymeric sand is simpler.
How long does joint-stabilizing sealer last?
SEK says SB-1300 may need reapplying every 2 to 3 years, depending on traffic, weather and cleaning. Reseal when the joints start to loosen or water stops beading, not on a fixed date.
Should I seal pavers after polymeric sand?
Only if you want the surface sealed, and only after the joint has cured. Techniseal's natural-look sealer asks for 30 days, and other brands range from 7 to 30. Use a normal spray-and-roll coat, not a flood coat.
