Selection reference
Choose concrete finishing products by stage of the slab
Each stage of a placement has its own standard and its own window. Confirm the specified test method, compatibility with the flooring, coating or topping that follows, and the time available between placement and the next trade.
| Application or product type | What to confirm | Standards and approvals commonly specified |
|---|---|---|
| Curing compounds, cure-and-seals and curing blankets | Freshly placed slabs, walls, pavements and toppings. Confirm whether a membrane-forming or dissipating compound is specified, whether the surface later receives flooring, coatings or an overlay that needs a clean bond, the pigment (white for exterior reflectance), VOC limits and the application timing after final finishing. | ASTM C309 for liquid membrane-forming curing compounds; ASTM C1315 for cure-and-seal products; ASTM C171 for sheet materials and curing blankets; ASTM C156 moisture retention; ACI 308R curing guidance. |
| Densifiers and liquid hardeners | Warehouse, manufacturing and polished floors. Confirm the silicate chemistry (sodium, potassium or lithium), slab age and porosity, dilution and coverage rate, the burnishing or polishing sequence and whether a guard or sealer follows. A densifier reduces dusting and improves abrasion resistance; it is not a waterproofing sealer. | ASTM C779 abrasion resistance; ACI 302.1R floor construction guidance; ASTM C805 or manufacturer surface-hardness data where specified; VOC limits for the jurisdiction. |
| Dry-shake floor hardeners | Heavy-traffic industrial floors, loading docks and wash-down areas. Confirm mineral or metallic aggregate, application rate in pounds per square foot, timing against bleed water, color, the finishing equipment available and the curing method that follows the shake. | ASTM C779 abrasion resistance; ASTM C109 compressive strength of the hardener mortar; ACI 302.1R placement and finishing guidance; manufacturer application rate and curing requirements. |
| Penetrating sealers and water repellents | Bridge decks, parking structures, exterior flatwork and masonry exposed to freeze-thaw, de-icing salts or wind-driven rain. Confirm silane or siloxane chemistry, solids content, substrate porosity, breathability, chloride-screening performance, dry time before traffic and the reapplication interval. | NCHRP Report 244 Series II water absorption and chloride screening; ASTM C672 scaling resistance; ASTM E96 vapor transmission; ASTM D6489 or ASTM E514 water absorption where specified. |
| Waterstop, joint sealing and load-transfer dowels | Construction, expansion and retrofit joints in tanks, foundations, tunnels and slabs. Confirm the joint type and movement, head pressure, chemical exposure, splice or heat-weld method and continuity through intersections; for hydrophilic strips and swellable sealants confirm confinement, primer and protection from premature wetting; for dowels confirm alignment and load-transfer requirements. | CRD-C 572 for PVC waterstop; ASTM D412 or ASTM D638 tensile and elongation; ASTM D2240 hardness; ACI 350 for environmental structures; ACI 224.3R joint design; ACI 302.1R and ACI 360R for slab joints and dowels. |
| Waterproofing membranes and cementitious waterproofing | Below-grade walls, planters, plaza and parking decks, balconies and water-holding structures. Confirm positive- or negative-side application, substrate moisture and cure, primer, wet and dry film thickness, protection course, terminations and detailing at penetrations and joints, and traffic exposure for deck systems. | ASTM C836 for cold liquid-applied below-grade membranes; ASTM C957 for traffic-bearing systems; ASTM D5385 hydrostatic pressure resistance; CRD-C 48 permeability for cementitious waterproofing; manufacturer detailing for sheet systems. |
| Urethane chemical grouts for leak sealing | Active leaks through cracks, joints and pipe penetrations in existing concrete. Confirm hydrophobic foam or hydrophilic gel, whether the leak is active or dormant, expected joint movement, water temperature, injection equipment and any potable-water contact. | NSF/ANSI 61 for potable-water contact; ASTM D1621 and ASTM D1622 cured-foam compressive strength and density; ACI 224.1R and ACI 546R crack repair guidance; manufacturer injection procedure. |
Published coverage, cure and performance values apply only at the stated dilution, temperature, substrate condition and film thickness. Use the current product datasheet before approving a substitution. For joint products and membranes in depth, see the Waterstop and Deck Coatings and Membranes pages.
Field planning
Plan the concrete finishing sequence
Finishing products work in sequence, and each one changes what the next one can bond to. Use the manufacturer instructions with the project specification and record the placement date, weather and product applied at each step.
Curing window and moisture retention
Apply the curing compound as soon as the surface will not mar, or cover with wet blankets, and keep curing continuous for the specified period. Hot, windy or cold weather changes the timing; follow ACI 308R hot- and cold-weather guidance and the product’s temperature limits.
Choose the curing method with the next trade in mind. A membrane-forming compound may need mechanical removal before flooring, coatings or toppings, while a dissipating compound or blanket leaves a surface that can be prepared normally.
Sequence for hard-wearing floors
Dry-shake hardeners go on at the bleed-water stage and are floated and troweled into the surface, then cured. Densifiers follow once the slab has reached the age the datasheet requires, and are worked into the surface at the specified dilution before burnishing or polishing.
Keep the sequence compatible: confirm that the cure-and-seal, densifier and any finish guard are approved to follow one another, and allow the stated dry time before traffic or the next application.
Joints and waterstop continuity
Position waterstop at the center of the section and support it so it stays in place during placement. Splice PVC by heat welding with the manufacturer’s tooling, and carry the profile continuously through corners and intersections using factory fittings where available.
Hydrophilic strips and swellable sealants need clean, primed concrete, confinement by the second placement and protection from rain or standing water before the pour. Set load-transfer dowels parallel to the slab surface and to each other, following the joint layout.
Waterproofing and leak repair
Positive-side membranes need a cured, dry, profiled substrate, the specified primer and film thickness, and a protection course before backfill. Deck systems need substrate moisture within limit, correct detailing at drains and terminations, and the full cure before traffic.
For leaks in existing structures, identify whether the water path is a crack, joint or penetration, then select a hydrophobic foam for active flow or a hydrophilic gel where movement is expected. Follow the injection procedure and confirm potable-water approval when required.
Before you order
Concrete finishing specifications & quantity planning
Use the project specification and the selected manufacturer data to confirm performance, coverage and the documents required for the installation.
Compare the specified performance
Read the specified standard and class together with its test method: ASTM C309 or ASTM C1315 type and class for curing products, abrasion and compressive values for hardeners, water absorption and chloride screening for repellents, and tensile, elongation and hardness for waterstop. Confirm VOC limits and any potable-water requirement.
Calculate coverage and lengths
For liquids, divide the surface area by the coverage rate at the specified dilution or film thickness, add a loss factor for texture and porosity, and multiply by the number of coats. For dry-shakes, multiply area by the application rate in pounds per square foot. For waterstop, measure joint length, add splices, fittings and waste, and round up to whole rolls or pieces.
Assemble the submittal
Identify the manufacturer, product, color, package size and SKU. Gather the current product datasheet, SDS, installation guide, splice or fitting details for waterstop, compatibility statements for products applied in sequence and any certification requested, such as NSF/ANSI 61. Ask for technical help when a document or limit is unclear.
Project orders
Request concrete finishing project pricing
Send the specified curing, hardening, sealing or waterproofing products and quantities for your pour, floor or structure. If the product is still under review, include the specification, slab details and exposure.
Include with your request
- Manufacturer, product, color and package size
- Slab or wall area, or joint length and profile
- Placement date, finish, exposure and next trade
- Delivery ZIP and required-on-site date
Concrete finishing questions
What are concrete finishing products?
They are the materials applied to concrete during and after placement to control how it cures, wears and resists water: curing compounds and blankets, densifiers and dry-shake hardeners, penetrating sealers and water repellents, waterstop and joint products, waterproofing membranes and leak-sealing urethane grouts. Finishing tools such as trowels and floats are listed under Tools and Accessories.
What is the difference between a curing compound and a cure and seal?
A curing compound is formulated to retain moisture while new concrete gains strength and is tested to ASTM C309; some dissipate over time so the surface can be prepared for later work. A cure and seal is tested to ASTM C1315 and stays on the surface as a sealer after curing, adding stain and moisture resistance. Choose by what the surface will receive next and by the specified standard.
Can flooring or a coating go over a slab cured with a curing compound?
Only if the compound is approved for that use or is removed first. Membrane-forming compounds can interfere with adhesives, coatings and overlays, so specifications often call for a dissipating compound, wet curing or blankets where a later bond is needed. Confirm compatibility with the flooring or coating manufacturer and prepare the surface as their instructions require.
Is a concrete densifier the same as a concrete sealer?
No. A densifier reacts with the concrete to harden the surface and reduce dusting, and it leaves the slab breathable; it does not form a film or block liquids. A sealer or guard applied after densifying provides stain and moisture resistance. Many polished-floor systems use both in sequence.
Which waterstop is used in a construction joint?
Ribbed centerbulb or flat ribbed PVC waterstop is the common choice for construction and expansion joints in new placements, sized by head pressure and expected movement. Hydrophilic strips and swellable sealants suit confined construction joints and pipe penetrations, and retrofit systems bond new placements to existing concrete. Follow the project specification and the manufacturer’s splice and detailing instructions.
How do I stop an active leak through a concrete crack or joint?
Active leaks are usually sealed by injecting a urethane chemical grout: a hydrophobic foam that expands on contact with water to fill the crack, or a hydrophilic gel where the joint will move. Identify the water path, drill and set ports per the procedure, and confirm potable-water approval when the structure holds drinking water.
How much curing compound or waterstop do I need?
For liquids, divide the area by the published coverage rate at the specified application rate, add a loss factor for texture and porosity, and multiply by the number of coats. For waterstop, total the joint length, add splices, fittings and waste, and round up to whole rolls or pieces. Dry-shakes are estimated by area times the specified pounds per square foot.
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