How to Prepare Pavers Before Sealing (What Pros Do)

Why Prep Is Everything

Sealer bonds to whatever is on the surface beneath it. Apply it over dirt, old sealer residue, efflorescence, or standing moisture and you are not protecting your pavers — you are locking those problems in. The sealer will fail within months, leaving you with peeling, hazing, and the cost of starting over.

At Go Go Gloss, we follow a strict pre-sealing process on every job. What looks like a simple spray-and-squeegee operation is actually preceded by hours of inspection, cleaning, and preparation. Here is exactly what we do — and why each step matters.

Step 1 — Inspection

Before any equipment comes off the truck, a technician walks the entire surface. We are looking for:

• Cracks and broken pavers — these need to be repaired or replaced before sealing, not sealed over
• Loose or sunken pavers — settlement issues that will trap water under the sealed surface
• Weed intrusion through joints — weeds must be removed and joints refilled before sealing
• Low spots where water pools — these indicate drainage problems that sealing alone will not fix
• Existing sealer condition — peeling, bubbling, or hazing sealer must be stripped before a new coat is applied

That last item is critical. Many homeowners assume new sealer can go right over old sealer. In most cases, it can — but only if the old sealer is still in solid condition and chemically compatible. When it is failing, you must strip it first, or the new coat will fail just as fast.

Step 2 — Power Washing

Pressure washing removes dirt, biological growth (algae, moss), and loose debris from the paver surface and joints. The right pressure setting depends on the material:

• Concrete pavers: 2,500–3,500 PSI with a turbo nozzle on joints and a fan tip on the surface
• Travertine and natural stone: 2,000–2,500 PSI — higher pressure can damage the surface of softer stone
• Brick pavers: 2,000–3,000 PSI depending on age and hardness

We use a turbo nozzle to blast debris from the joints — that is where organic material accumulates and where weed seeds hide. A flat fan tip covers the paver surface efficiently without streaking. The goal is a completely clean, open-pore surface that will accept sealer uniformly.

Step 3 — Efflorescence Treatment

Efflorescence is the white chalky residue that appears on the surface of concrete and masonry pavers. It is caused by soluble salts migrating to the surface through capillary action — a natural process that is especially common in Arizona's dry, alkaline soil conditions.

Pressure washing alone will not remove efflorescence. It must be treated with an acid-based efflorescence cleaner:

• Apply the cleaner to the affected area and let it dwell for the manufacturer-recommended time
• Agitate with a stiff brush to break up the salt deposits
• Neutralize the acid with a baking soda and water solution
• Rinse thoroughly and allow to dry

Sealing over efflorescence traps the salts beneath the sealer, where they continue to migrate and eventually cause the sealer to lift from below. It will look fine for a few weeks, then begin bubbling and peeling from the inside.

Step 4 — Joint Sand Inspection and Replacement

The sand between pavers is not just filler — it is what locks the entire surface together and keeps weeds and insects out. When joint sand erodes or dries out, the structural integrity of the paver field is compromised.

We inspect every joint for:

• Sand depth — joints should be filled to within 1/8 inch of the paver surface
• Weed growth — any weeds are removed and joints cleared before refilling
• Ant intrusion — in Arizona, fire ants and other species nest in paver joints

Where sand is low, we top-fill with polymeric sand — a sand product that contains binding agents activated by water. Once compacted and wetted, polymeric sand sets up hard, resisting weed germination and ant nesting. The sand must be compact and fully set before sealing, or the sealer will trap loose material in the joint.

Step 5 — Drying Time

This is the step that homeowners most often try to rush — and the one that causes the most sealer failures.

Sealer applied over damp pavers will trap moisture beneath the surface. As that moisture tries to escape, it pushes up through the sealer, creating a white haze or milky appearance known as blushing. In severe cases, it causes the sealer to delaminate entirely.

Our minimum drying standards in Arizona:

• Summer (May–October): 24 hours after washing — Arizona heat accelerates drying significantly
• Winter (November–April): 48 hours minimum — cooler temperatures slow moisture evaporation
• After monsoon rain: 48–72 hours, depending on how much water penetrated the joints

We use a professional moisture meter to verify surface readings before any sealer goes down. The meter takes the guesswork out of the decision. If the pavers are not ready, we reschedule rather than compromise the job.

What Happens When You Skip Prep

The consequences of poor preparation show up fast:

• Peeling within 3–6 months — sealer applied over contaminated or incompatible old sealer begins lifting at the edges and in high-traffic areas
• White haze (blushing) — trapped moisture creates a milky, opaque appearance that is extremely difficult to remove without stripping
• Uneven finish — dirt and debris beneath the sealer show through as lumps, streaks, and inconsistent sheen
• Accelerated joint sand failure — sealer locks in loose, degraded sand that continues to erode underneath

When we are called in to fix a bad seal job, the root cause is almost always inadequate preparation — not a product failure. The right sealer applied correctly to well-prepared pavers will last 2–3 years in Arizona. A shortcut taken on prep day costs you that entire service life.