Spring is when GTA homeowners look at their interlock for the first time since November. Polymeric sand has eroded out of the joints in the high-runoff zones along the apron and the driveway edge. Calcium salts have bloomed white across the surface from the freeze-thaw cycle pulling moisture up through the pavers. The colour looks a half-shade flatter than it did last August, even on a wet day. And by mid-April the flyers start landing in mailboxes: “Interlock Sealing — $1.50/sqft, this week only.”
The question every homeowner asks at this point is which of those problems sealing actually fixes, and whether the $1.50/sqft pitch is the same product the higher-end installer is quoting at $3.50/sqft. The honest answer is that interlock sealing is a real maintenance investment when it is done with the right product on a clean, cured paver field, and it is largely cosmetic theatre when it is sprayed over efflorescence and joint-sand erosion that needed attention first. The gap between those two outcomes is what the rest of this guide is about.
When sealing actually makes sense in Spring 2026
Three timing rules cover most of the GTA interlock sealing decision.
If the pavers were installed this past summer or fall, do not seal them yet. Manufacturers and installers across the industry agree that newly installed pavers should sit through 60 to 90 days of weather before the first seal. The reason is efflorescence: salts inside the concrete or natural stone migrate to the surface as moisture evaporates over the first couple of months, and sealing before that process completes traps a haze under the film that you cannot remove without stripping the sealer back off. Aim for the first seal between September of the install year and June of the following year, after at least one wet-and-dry cycle has had a chance to push the salts out.
If the pavers are three to five years old, were sealed once before, and the surface is reading flat and chalky, that is the canonical reseal window for most penetrating products and most quality acrylics. Cheap acrylic spray-on sealers can fail within the first year and need to be reapplied annually. Better-grade acrylics last two to three years. Silane-siloxane penetrating sealers commonly run five to seven years on residential foot-traffic patios and three to five years on driveways with vehicle wear. The reseal calendar should track the product, not the calendar.
If the pavers are older than seven or eight years, never sealed, and the joints are eroded, the sequence matters more than the product. Polymeric sand recharge first, efflorescence cleaning second, sealing third. Skipping the joint-sand step and going straight to the sealer is the most common mistake on this kind of job because the sealer alone does not stop weed growth, ant colonies, or sand washout. There is a related write-up on home.renovation.reviews that goes through the polymeric sand refresh process in detail at GTA Polymeric Sand Refresh Spring 2026: When Interlock Joints Need Topping Up, How It's Done Right, and Real Costs and is worth reading before you book any sealing work on an older paver field.
The two sealer chemistries that matter
The product label conversation collapses into two real categories: sealers that penetrate the paver and sealers that form a film on top of it. Everything else is marketing.
Penetrating sealers use silane and siloxane chemistry. The active molecules are small enough to soak into the pores of the concrete or stone, where they react with the masonry and form a hydrophobic barrier inside the paver itself. Water that lands on the surface beads up and rolls off rather than soaking in. There is no glossy film, no colour change, no surface texture difference. Reputable manufacturers report water absorption reductions in the 80 to 95 percent range on properly applied penetrating sealers. The trade-off is that they do not enhance colour, do not stabilize joint sand on their own, and do not give the deep wet appearance some homeowners want.
Film-forming sealers sit on top of the paver. The two common chemistries are acrylic and urethane. Acrylic film sealers are the workhorse of the GTA driveway-sealing industry because they are straightforward to apply, they enhance colour, and they can be specified in a wet-look gloss or a low-sheen matte. Urethane sealers are tougher and last longer but cost more and usually come as two-part products that have to be mixed correctly on site. Both film chemistries will also help lock down polymeric sand in the joints, which is one of the reasons many installers recommend a sealer with joint-stabilizing properties on driveways that get a lot of vehicle wear.
The clean way to think about this is that penetrating products protect the paver from inside, and film products protect the paver from above and add a finish. Neither is wrong; they answer different questions.
Wet-look versus matte: a finish decision
The “wet-look” sealer pitch is essentially a solvent-based film-forming acrylic that deepens the colour the way the surface looks ten minutes after a rain. It works because the film has a gloss component and a translucent darkening effect on the concrete or stone underneath. People who like it really like it; the deeper colour reads as more upscale and the finish hides minor staining better than a matte. People who dislike it tend to dislike how artificial the wet appearance reads on a sunny day, especially next to plain-grey concrete walkways or a non-wet-look paver section near the door.
Matte and natural-look sealers are usually water-based film-forming acrylics or urethanes that go on with no gloss or a satin sheen. They preserve the original paver appearance, which is what a lot of GTA homeowners on heritage streets want. The paver should look like a paver, not like a wet paver. Penetrating silane-siloxane sealers are the most natural-look option of all because they leave no surface film at all.
Cost-wise the chemistries cluster like this for spring 2026 GTA jobs: water-based acrylic penetrating sealers run roughly $1.00 to $1.50 per square foot installed; solvent-based wet-look acrylics $1.50 to $2.50 per square foot; silane-siloxane penetrating $2.00 to $3.00 per square foot; two-part urethane $2.50 to $4.00 per square foot. The numbers move with surface area (smaller jobs cost more per square foot in setup time), substrate condition, and whether efflorescence cleaning is included or quoted separately.
Brand tiers worth knowing
Three brand families dominate the professional GTA interlock-sealing market and most installers will quote one or two of them.
Techniseal is the brand pavers manufacturers like Belgard recommend most often. Their Paver Prep efflorescence cleaner and Pavix CS-22 colour-stabilizing sealer are both used widely on Unilock and Techo-Bloc installs across the GTA. Techniseal’s positioning is natural-look, breathable, and joint-stabilizing, with a satin finish that lands closer to penetrating performance than to a glossy film.
Alliance Gator’s wet-look products are the other half of that pitch. Their Gator Seal line is the market default if the homeowner wants the deep-colour finish, and their efflorescence cleaner is one of the best-rated commercial options for pre-seal prep work.
Surebond’s SB-6000 WB is a water-based film sealer with strong slip-resistance specifications, which matters on patio surfaces that see bare feet and wet pool decks. It is the right call when slip rating is the top priority over finish appearance.
Below those three brand tiers there are a lot of generic acrylic sealers in the $25 to $40 per gallon range at the big box hardware stores. They are not always bad, but they tend to be lower-solids formulas, fail faster, and re-coat sooner. The contractor-grade products from Techniseal, Alliance Gator, Surebond, Foundation Armor, and SRW typically run $50 to $90 per gallon and cover 100 to 200 square feet per gallon depending on the porosity of the substrate.
Efflorescence: clean it before you seal
The single most common reason a fresh seal job looks bad after the first month is that the installer sealed over efflorescence that should have been cleaned off first. Trapped salts produce a milky haze under the film that does not lift with a power wash because the haze is now physically inside the sealer layer. Stripping that off is a chemical-strip job that costs more than the original seal.
The cleaning sequence is short. Sweep the surface dry. Mix a paver-prep efflorescence cleaner per the label dilution (most professional cleaners are mild acids or chelating agents). Apply with a low-pressure sprayer or broom. Dwell five to ten minutes. Rinse thoroughly. Let the paver field dry for at least 24 hours before sealing. On bad efflorescence the cleaning step may need to be repeated, and on a paver that has bloomed for years, it may need a 12-to-1 water-to-acid wash done by an installer who knows how to neutralize the runoff afterward. PPE is not optional on the acid step.
Two things to verify in the quote when efflorescence is part of the job: first, that the cleaning is included in the line item, not added as an extra; second, that the seal is scheduled at least one full clear day after the cleaning so the paver can fully dry. A same-day clean-and-seal is usually a sign the installer is rushing.
Real GTA cost bands for Spring 2026
For a typical paver field these are the spring 2026 price ranges most homeowners are seeing across the GTA:
A 300 square foot patio sealed with a contractor-grade water-based acrylic penetrating product runs $300 to $600 turnkey. The same patio sealed with a silane-siloxane runs $600 to $900. The same patio sealed with a solvent-based wet-look acrylic runs $450 to $750.
A standard 600 square foot driveway sealed with a contractor-grade joint-stabilizing acrylic runs $900 to $1,800. A two-car 800 to 1,000 square foot driveway with the same product runs $1,200 to $2,500. Add 20 to 40 percent on top of those numbers for an integrated efflorescence cleaning and polymeric sand refresh. That is a separate scope that the better installers bundle into a “spring restoration” package.
A flagstone or natural stone patio runs about 30 to 50 percent above concrete-paver pricing because natural stone needs a more careful sealer match (some sealers darken some stones permanently) and the joints are usually tighter and harder to clean.
If the quote is below those bands, the most likely explanation is that the product is a low-solids generic acrylic that will need recoating sooner than you expect. Sealer is one of the parts of an interlock job where pricing tracks product quality fairly cleanly.
DIY versus hiring out
A 300 square foot patio sealed by a homeowner with a quality $80 gallon of contractor-grade acrylic and an afternoon of careful work is a perfectly reasonable DIY project. Materials run $80 to $150, equipment is a low-pressure sprayer and a roller or wide brush, and the work is tedious but not skilled.
A 1,200 square foot driveway with apron flares, drain inlets, and a transition to a flagstone walkway is not. The volume of material involved (six to eight gallons), the precision of the cut-in around the inlets and the garage door track, and the need for a dry-window forecast across at least 24 hours are all hard to manage on a weekend without prior experience. The DIY mistake on a job that size (over-applying the sealer on a humid day, missing the lap line, rolling instead of spraying on a rough-faced paver) usually costs more in stripper and re-do than the labour spread of hiring it out.
The decent middle ground is to do the polymeric sand refresh DIY and hire out the sealing. That splits the budget into the part that is forgiving (sand work) and the part that is not (sealer work).
Five questions to ask before signing
The quote should specify the exact sealer product brand and SKU, not just “premium acrylic sealer.” If the installer cannot tell you the SKU, they probably cannot tell you the cure time or the recoat schedule either.
The quote should specify whether efflorescence cleaning and polymeric sand refresh are included, excluded, or quoted as a separate line. Ambiguity here is where most spring upsells happen.
The quote should specify the dry-window requirement and the planned weather check. A reputable installer will postpone if rain is forecast within 24 hours of the planned application date. The cheap pitch is to spray regardless and book the next job.
The quote should specify the warranty, including what it does not cover. Most sealer warranties cover material defects only and exclude tire-marking, salt damage from de-icer, and stains from organic material like leaves left on the surface. That is fine; you just want to know what it covers before you sign.
The quote should specify the cure time. Foot traffic should not return to a sealed paver field for 24 hours; vehicle traffic for 48 to 72 hours. If the installer says you can drive on it the same evening, they are using a low-grade product and you should expect a shorter service life.
What this looks like alongside the rest of an interlock spring
Sealing is one of three spring restoration steps that work together. The polymeric sand refresh handles joint integrity and weed-and-ant suppression. The efflorescence cleaning handles surface mineral residue. The seal handles water absorption, colour, and joint-sand stabilization. Skipping any one of those three steps usually shortens the life of the other two. Sealing over loose joints will not stop the joints from washing out further; sealing over efflorescence locks the haze in; refreshing sand without then sealing leaves the new sand exposed to the same erosion that destroyed the original.
There are a few related write-ups on home.renovation.reviews that are useful companion reads. The Pickering interlock driveway case study at Interlock driveway installed in Pickering: 12-inch base, Unilock Beacon Hill, full cost and 2-year update walks through a real Unilock Beacon Hill installation with the substructure spec that affects how well a seal will hold up over the first decade. The polymeric sand refresh guide at GTA Polymeric Sand Refresh Spring 2026: When Interlock Joints Need Topping Up, How It's Done Right, and Real Costs is the canonical companion piece for the sand step described above. If your driveway is asphalt rather than interlock, the asphalt driveway sealing guide at GTA Driveway Sealing Spring 2026: When to Seal, When to Skip, and Real Costs covers the entirely different chemistry that applies to asphalt sealcoat. And if you are considering a pool deck resurface alongside the interlock work, the pool deck resurfacing guide at GTA Pool Deck Resurfacing Spring 2026: Concrete Overlay vs Interlock Replacement vs Stone Cladding, Slip Resistance, Coping, and Real Costs by Method walks through the concrete-overlay versus interlock-replacement decision.
The bottom line by use-case
For a three-to-five-year-old paver field that has been sealed once and is reading flat, a fresh coat of contractor-grade water-based acrylic penetrating sealer at $1.00 to $1.50 per square foot is one of the better-value spring 2026 investments most homeowners will make on the outside of the house.
For a driveway with eroded polymeric sand and visible efflorescence, the right sequence is sand refresh, clean, dry, then seal. That is typically a $1,200 to $2,200 spring restoration package on a standard double-car GTA driveway.
For a homeowner who wants the deep colour appearance, a solvent-based wet-look acrylic at $1.50 to $2.50 per square foot is the right product, with the understanding that the finish will need refreshing every two to three years.
For a homeowner who wants the longest service life and does not care about the colour-deepening effect, silane-siloxane penetrating sealer at $2.00 to $3.00 per square foot is the right product, with five-to-seven-year service life under residential traffic.
For a brand-new paver field, wait. Sixty to ninety days of weathering before the first seal, then any of the above products on a clean, cured surface.
We have been doing interlock work across the GTA for more than fifty years, and the seal job is one of the parts of a paver lifecycle where the difference between a $0.85 per square foot flyer pitch and a $2.50 per square foot proper job is mostly invisible to the homeowner on day one and very visible by year two. If you have a fresh quote, a strange efflorescence pattern, or a sealer brand on the quote you have not heard of, post it as a reply with a photo and a few of us will weigh in.
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