Concrete looks solid and behaves like a sponge. A driveway, patio, or walkway is a network of capillary pores that pull in water and everything dissolved in it, and nearly every way exterior concrete fails in South Louisiana traces back to that fact. Sealing is the intervention that stops water at the surface. Resurfacing is what you do once water has already taken the surface away. Below is how to tell which situation you are in and what each one costs.
Why concrete sealing makes sense in Baton Rouge
Exterior concrete here lives in the worst combination of conditions for a porous material: heavy rainfall, sustained humidity that keeps slabs from drying out, intense summer sun, and a short winter that still delivers freezing nights. Four specific mechanisms follow from that:
Rain volume finds every pore
Baton Rouge gets a lot of rain, and concrete is porous by nature. Water wicks in, carries dissolved salts and organics with it, and leaves them behind when it evaporates. That is what discoloration, efflorescence, and dark staining on an untreated patio actually are — deposits left inside the surface, not dirt sitting on it.
Organic growth on damp slabs
Shade plus humidity plus a slab that never fully dries equals mildew, algae, and that black-green film on north-facing walkways. A sealed surface stays cleanable because the growth has nothing porous to root into and can be washed off instead of ground out.
Storm season water intrusion
When a driveway or walkway saturates and then holds water against the slab, the freeze-thaw damage that plagues northern concrete is replaced by a slower version: saturation, salt movement, and surface scaling. Sealing before the wet season is far cheaper than resurfacing after it.
Sun, heat, and a handful of freeze nights
Exterior slabs here bake through summer, then take a handful of freezing nights each winter. Concrete that is already saturated is the concrete that spalls when the temperature drops — which is why keeping water out is the whole strategy for exterior slabs in this climate.
The same porosity that ruins exterior slabs also drives moisture up through interior ones, which is why the humidity conversation runs through everything we do — see how Louisiana humidity affects concrete floors. And because saturation is cumulative, timing matters: our guide to sealing before storm season covers why the work is cheaper done early than repaired later.
Sealing or resurfacing? Read your slab first
| What you are seeing | Likely answer | Why |
|---|---|---|
| Concrete is sound, just stained or dull | Seal it | Cheapest option that actually protects the slab |
| Surface is dusting or lightly worn | Seal it, or microtopping if you want a new look | Sealer stops further loss; overlay resets appearance |
| Surface is spalling or scaling broadly | Resurface | The wearing surface is gone; a sealer has nothing sound to protect |
| Slab has settled or heaved | Neither yet | Address the movement first — an overlay will crack along the same line |
| Old coating is peeling | Remove, then decide | Removal is its own line item; never seal or overlay over a failing film |
What's included in a concrete sealing job
1. Assessment: is it a sealing candidate?
Sound concrete with cosmetic wear gets sealed. Concrete with active settlement, structural cracking, widespread scaling, or a failing previous coating needs a different scope. This is the honest fork in the road, and it happens before any product is recommended.
2. Deep cleaning and stain treatment
Pressure washing, degreasing where oil has soaked in, and treating organic growth. A sealer locks in whatever is on the slab when it goes down, so anything you do not want to look at for the next several years comes off first.
3. Crack and joint repair
Cracks are cleaned out and filled with a flexible or rigid material depending on whether the crack moves. Control joints are honored rather than bridged, because a sealed-over joint just splits along the same line the next time the slab expands.
4. Profiling where needed
A penetrating sealer wants an open, clean surface. A film-forming or decorative sealer usually wants a light mechanical profile so it has something to bond to. Which one you are getting determines how much prep the slab needs.
5. Sealer application
Penetrating silane or siloxane sealers soak in and react below the surface, repelling water without changing the look or the traction. Film-forming acrylics and urethanes sit on top, darken and enrich the color, and add gloss. Two thinner coats outperform one heavy one on either type.
6. Cure and return to service
Foot traffic generally returns within hours; vehicles wait a day or more depending on product and weather. Sealed exterior concrete needs periodic reapplication — film-formers more often than penetrating sealers — and that maintenance interval is part of the recommendation, not a surprise.
What's included in a resurfacing job
Resurfacing is a heavier scope: it bonds a new wearing surface to the old slab, so the preparation is more like a coating install than a maintenance visit.
1. Diagnose why the surface failed
A worn wearing surface, spalling from saturation, or an old broom finish that has gone smooth are all resurfacing candidates. Settlement and structural cracking are not — an overlay on a moving slab reproduces the crack. Getting this right is most of the value of the assessment.
2. Mechanical preparation
Grinding or shot blasting removes loose material, laitance, and old coatings, and opens a profile. An overlay is a bonded topping: it is only as sound as the concrete under it and the bond you create.
3. Repair and bond coat
Spalls are rebuilt, cracks addressed, and a bonding agent or slurry coat is applied so the new topping keys into the old slab rather than sitting on it.
4. Apply the overlay
A thin microtopping renews color and texture at a fraction of the thickness of new concrete. A heavier stamped or textured overlay adds pattern and can be integrally colored. Thickness is chosen for the wear the slab will see, not for appearance alone.
5. Finish, texture, and seal
The overlay is textured — broom, knockdown, stamped, or troweled — then sealed. On an exterior slab, texture is a safety decision as much as a design one, because a smooth sealed surface is slick when wet.
6. Cure and care
An overlay needs a longer cure than a sealer before vehicles return, and the sealer over it becomes the maintenance item going forward. You get the schedule and the resealing interval in writing.
What sealing and resurfacing cost
$2–$6 per square foot for sealing; resurfacing quoted by condition. Planning ranges for the Baton Rouge metro:
Sealing is the lowest-cost way to protect concrete you are otherwise happy with. Resurfacing costs more because it rebuilds the wearing surface rather than just protecting it.
Small jobs carry a project minimum of about $400–$700, since the crew, the equipment haul, and the material batch cost the same on a 150-square-foot porch as on a 400-square-foot patio. Sealing a driveway and coating the garage on the same visit is common and usually more efficient than two separate mobilizations — see garage floor coatings and the full Baton Rouge cost guide.
Sealer types and what each one does to the look
The choice is not only about protection. Penetrating silanes and siloxanes react inside the concrete and leave the appearance and the traction essentially unchanged, which makes them the safe pick for walkways and pool surrounds. Film-forming acrylics and urethanes sit on the surface, deepen the color, and add sheen — the wet-look finish people usually mean when they ask for a sealed patio — but they wear under UV and traffic and need reapplication more often, and they are slicker when wet unless texture or additive is included.
For interior slabs, a sealer is often the wrong tool entirely. A garage or shop floor that takes hot tires and chemical spills wants a real coating system, whether that is a polyaspartic build, a flake epoxy floor, or a commercial epoxy spec. A thin sealer on a garage slab will not survive hot-tire contact, and it is a common reason homeowners end up redoing a floor they thought was protected — the same trap covered in our DIY kit vs. professional comparison.
Frequently asked questions
How much does concrete sealing cost in Baton Rouge?
A penetrating sealer on sound concrete runs $2 to $4 per square foot, and a decorative or film-forming sealer runs $3 to $6 per square foot. Patio and driveway resurfacing is a bigger scope at $4 to $9 per square foot, because it rebuilds the wearing surface rather than just protecting it. Crack and spall repair is quoted after the slab is assessed. Small jobs carry a project minimum of about $400 to $700.
What is the difference between sealing and resurfacing?
Sealing protects the concrete you already have — it closes the pores so water, salts, and stains cannot get in, and it either leaves the appearance alone or enriches it slightly. Resurfacing replaces the wearing surface with a new bonded topping, which is what you do when the original surface has spalled, scaled, or worn away and there is nothing sound left to protect. Sealing is maintenance; resurfacing is a rebuild.
How often does exterior concrete need resealing in Louisiana?
It depends on the sealer type and how much sun and water the slab takes. Film-forming acrylics on an exposed driveway or patio generally need reapplication every couple of years, because UV and traffic wear the film. Penetrating silane and siloxane sealers react inside the concrete rather than sitting on top, so they last considerably longer, but they also do not add gloss. Choosing between them is really a choice between appearance and maintenance interval.
Will sealing stop my driveway cracks?
No, and it is worth being clear about that. Sealing keeps water out of sound concrete and slows the deterioration that water causes, but it does not carry load or hold a slab together. Existing cracks get cleaned and filled as part of the prep so water stops entering through them, and a filled crack usually remains faintly visible. If a crack is moving — widening, or with the two sides at different heights — that is a slab movement issue and no surface product will fix it.
When is the best time to seal concrete in Baton Rouge?
Before the wet season rather than after it, and on a slab that has had several dry days. Sealers need a dry substrate and moderate temperatures to cure properly, so the shoulder seasons are usually the easiest windows. The practical argument for sealing early is that saturation is what causes the scaling and staining you would otherwise pay to resurface later.
More answers on prep, products, and maintenance are on our concrete coatings FAQ.
Request a Baton Rouge concrete assessment
Tell us where the concrete is, how it is used, and what you are seeing — staining, dusting, scaling, cracks, standing water after rain, or a previous coating that is coming loose. We will look at the slab, tell you plainly whether it is a sealing candidate or a resurfacing candidate, and quote the scope that actually fits it. Sometimes the honest answer is that the slab needs a mason before it needs us, and we will say so.
Serving Baton Rouge and the surrounding metro, including Prairieville, Gonzales, Denham Springs, Zachary, Central, Baker, Walker, Port Allen, Addis & Brusly, and St. Gabriel.