Industrial Floor Coatings: Preparation & Slip Resistance

Industrial floor coating performance is determined long before the final coat is applied. Concrete condition, moisture content, existing coatings, surface profile, contamination, film thickness and curing conditions all influence whether a finished floor becomes a durable working surface or begins to fail prematurely.

For warehouses, workshops, factories, vehicle service areas, commercial buildings and other demanding Australian environments, the correct specification therefore starts with the substrate rather than the colour.

BG Coatings manufactures industrial coating systems in Australia for commercial, industrial and trade applications. The appropriate coating system should be selected around the actual substrate, traffic, contaminants and service conditions rather than treating every concrete floor as the same application.

Concrete Preparation Is Part of the Coating System

Concrete may appear solid while still presenting several adhesion problems.

Laitance, curing residues, oil, grease, dust, tyre contamination, weak surface material and remnants of previous coatings can all create a boundary layer between the coating and the structurally sound concrete below it.

A coating adheres to the surface it is actually applied to. If that surface consists of contamination or friable material, increasing the quality or thickness of the coating will not correct the underlying problem.

BG Coatings’ APEX Heavy Duty Concrete Sealer application guidance requires surfaces to be completely clean and free from debris and foreign matter before coating. For new or unpainted concrete, contaminating material, laitance and loose material must be removed, with mechanical preparation methods including grinding or grit blasting identified in the preparation procedure.

Mechanical preparation can be particularly important on industrial floors because it provides two functions simultaneously:

• removal of weak or contaminated surface material;
• creation of a suitable surface profile for the coating system.

A highly polished steel-trowelled slab can behave very differently from porous or rough-finished concrete. The specification must account for that difference.

New Concrete Must Be Allowed to Cure

Newly placed concrete should not be treated as a dry substrate simply because the surface looks dry.

Water remains within the slab during curing and drying. Applying a relatively impermeable coating while excessive moisture remains can interfere with adhesion and may contribute to blistering, whitening, delamination or other coating defects.

BG Coatings’ APEX application guidance states that new concrete should generally be allowed at least four weeks after construction and notes that some slabs may require up to eight weeks, depending upon environmental conditions, before the substrate reaches the required moisture condition.

For the APEX Heavy Duty Concrete Sealer system, the technical data specifies substrate moisture below 5%.

That percentage is considerably more useful than relying on an arbitrary waiting period alone.

Concrete drying time changes with slab thickness, ventilation, temperature, relative humidity, groundwater conditions and the presence of membranes or other construction materials. A commercial specification should therefore assess the actual substrate rather than assuming every slab reaches coating condition on the same day.

Existing Floor Coatings Must Be Identified Before Recoating

One of the most important compatibility decisions on an existing industrial floor is determining what coating is already present.

Acrylic, enamel, water-based coatings, polyurethane and epoxy systems cannot automatically be treated as interchangeable substrates.

Applying a chemically incompatible coating can soften, wrinkle or attack an existing finish. In other situations, a new coating may simply fail to develop adequate adhesion.

The BG Coatings APEX application guide specifically warns that APEX is not intended as an overcoat for standard enamel or epoxy floor finishes. It includes a compatibility-testing procedure for identifying the approximate type of existing coating before a maintenance coat is specified.

This is an important distinction on older warehouses and workshops where the coating history may have been lost.

The floor may have been coated several times over decades. Different sections may even contain different materials following repairs, tenancy changes or extensions.

Where coating history is uncertain, testing and a small trial area are substantially safer than assuming compatibility from appearance alone.

Penetration and the First Coat

Porous concrete does not behave like a sheet of metal or a previously coated surface.

The first coat can penetrate into the surface rather than simply forming a uniform film over it. The porosity and finish of the slab therefore influence both material consumption and the way the first coat should be applied.

For the BG Coatings APEX Heavy Duty Concrete Sealer system, the technical data provides different first-coat dilution guidance according to the substrate:

• previously sealed compatible surfaces: 0–10%;
• rough stippled concrete: 20%;
• smooth steel-trowelled concrete: 50%.

The system then uses an undiluted topcoat to develop its final performance characteristics.

This illustrates why coverage figures should not be treated as fixed numbers.

A porous slab can absorb substantially more of the initial coat than a previously sealed surface. BG Coatings lists an approximate spreading rate of 4–6 m² per litre per coat for APEX, with actual coverage dependent upon substrate porosity.

Commercial quantity calculations should therefore include the condition and porosity of the concrete rather than calculating litres from floor area alone.

Film Thickness Is a Specification, Not a Guess

A floor that looks completely coloured is not necessarily carrying the required coating thickness.

Coatings develop their physical properties through the film left after application and solvent or water evaporation. Applying too little material can leave a visually acceptable finish while failing to achieve the intended protective film.

The BG Coatings APEX technical data specifies a minimum dry film thickness of 65 microns.

Film thickness becomes particularly important in commercial work because application rate can vary significantly between operators, rollers, surface profiles and sections of a large floor.

High points in rough concrete may receive less film than recesses. Extremely porous sections may absorb more material. Attempting to stretch a calculated quantity across additional square metres can progressively reduce the coating build.

The correct question is therefore not simply:

“Has the floor been painted?”

It is:

“Has the specified coating system been applied at the required film build over a correctly prepared substrate?”

That distinction separates decorative coverage from technical coating execution.

Slip Resistance Must Be Designed Into the Floor

Gloss and ease of cleaning are often desirable on commercial floors, but pedestrian safety cannot be considered after the coating has already been applied.

A smooth coated surface can become significantly more slippery when contaminated with water, oils, cleaning fluids or process residues.

Slip requirements should therefore be considered according to each operational zone.

A warehouse may contain relatively dry storage aisles alongside:

• wash-down areas;
• entrances exposed to rain;
• workshop bays;
• ramps;
• loading areas;
• food or process areas;
• pedestrian crossings;
• door thresholds.

These surfaces do not necessarily require the same texture.

BG Coatings’ technical data states that BG Floor Anti Slip Additive may be incorporated to improve traction on sloping surfaces and surfaces that may become slippery when wet. The APEX documentation also cautions that a smooth finish without anti-slip additive may not be appropriate for steep, smooth, high-traffic surfaces.

More texture is not automatically better.

Increasing surface texture may improve traction but can also make a floor harder to clean and may trap dirt or contaminants. Industrial floor design therefore involves balancing slip resistance with hygiene, cleaning requirements, wheeled traffic and operational use.

Industrial Floors Should Be Divided Into Service Zones

A 2,000 m² warehouse does not necessarily represent one coating environment.

Forklift turning areas can experience considerably greater mechanical stress than static storage zones. Workshop areas may be exposed to oils or chemicals. Pedestrian routes may require additional slip resistance. Roller-door thresholds may encounter water and outdoor contamination.

Instead of specifying every square metre according to the least demanding section of the building, divide the floor according to service conditions.

Typical zones include:

General storage areas
Primarily pedestrian traffic or light wheeled movement.

Forklift and pallet movement zones
Repeated turning, braking and concentrated wheel loading.

Workshop areas
Potential exposure to oils, fuels, hydraulic fluids and mechanical impact.

Wet or wash-down zones
Greater emphasis on traction and drainage.

Pedestrian routes and safety areas
Defined walkways where surface texture, visibility and maintenance requirements may differ from the surrounding floor.

BG Coatings identifies APEX applications including garage floors, car parks, shopping centres, showrooms, workshops, warehouses, factories and vehicle workshop or fuel-related environments, with the product data noting resistance to mild alkalis and most petrochemicals.

Actual chemical exposure should always be checked against the relevant current technical data rather than assuming that the word industrial means universal chemical resistance.

Temperature, Humidity and Dew Point Matter

Australian industrial coating work is frequently scheduled around production shutdowns rather than ideal weather.

That does not remove environmental limits.

Substrate temperature, ambient temperature and relative humidity affect application, solvent evaporation and curing. In large warehouses and partially open buildings, the slab can also remain cooler than the surrounding air.

For APEX Heavy Duty Concrete Sealer, BG Coatings specifies:

• surface temperature: 10°C to 40°C;
• ambient temperature: 10°C to 40°C;
• relative humidity: 10% to 85%;
• substrate temperature at least 3°C above dew point.

The dew-point requirement is particularly important.

A surface can appear perfectly dry while microscopic condensation is forming because the slab temperature is too close to the dew point. Applying a coating under those conditions introduces moisture directly at the interface where adhesion is required.

Coastal Australian environments can make this especially relevant because overnight and early-morning humidity can be high even after a hot day.

Timing the application therefore involves the concrete temperature, not simply checking the day’s maximum air temperature.

Dry Does Not Mean Fully Cured

Another common industrial flooring mistake is returning a coated area to service as soon as the surface can be touched or walked across.

Touch dry, recoat time, light pedestrian access and full cure describe different stages of coating development.

BG Coatings’ APEX technical data gives typical conditions at 25°C of:

• approximately 30 minutes touch dry;
• 2–4 hours before recoating;
• approximately 24 hours before light foot traffic;
• 7 days to full cure.

Cooler temperatures and higher humidity extend drying times.

A coating capable of supporting a person without leaving a footprint may still be developing its final properties.

Forklift traffic, vehicle tyres, pallet jacks, heavy equipment and chemical exposure can impose substantially greater demands than light pedestrian traffic. Return-to-service planning must therefore be part of the original project schedule rather than an afterthought once production is waiting to restart.

Coastal and Harsh Australian Conditions Change the Preparation Risk

Industrial facilities near the Australian coast face an additional contamination issue.

Moisture, airborne salts, wind-blown material and rapid changes in temperature can all affect the condition of exposed surfaces. Industrial sites may add oils, process contamination, hydraulic fluids, cleaning chemicals and vehicle residue to the same floor.

The practical response is not simply choosing a coating labelled for heavy-duty use.

The substrate still has to be cleaned, tested and prepared to the requirements of the actual coating system.

A technically sound specification considers:

1. substrate type and age;
2. concrete moisture;
3. existing coating chemistry;
4. surface contamination;
5. required surface profile;
6. expected traffic;
7. chemical exposure;
8. wet-area and slip requirements;
9. required film thickness;
10. application temperature and humidity;
11. dew-point margin;
12. curing and return-to-service time.

Ignoring any one of these variables can compromise an otherwise appropriate coating system.

Specify the Floor Before Ordering the Paint

Commercial floor coating quantities should be calculated only after the substrate and application system have been established.

Measure the actual coating area, identify different service zones, determine the number and type of coats required, account for concrete porosity and allow for the specified spreading rate.

Do not reduce the specified film build simply to make a predetermined quantity cover the project.

For larger commercial projects, provide BG Coatings with as much information as possible about the existing floor, including photographs, substrate age, previous coating type if known, approximate area, traffic conditions and any unusual chemical or slip-resistance requirements.

BG Coatings manufactures and supplies industrial coating products from Malaga, Western Australia, with technical information available for selecting and applying the appropriate system.

To view product data sheets, technical specifications, or to order commercial quantities online, browse the main BG Coatings Products Catalog.

The performance of an industrial floor coating is ultimately built from the concrete upwards.

Prepare the substrate correctly. Confirm compatibility. Control moisture. Build the specified film. Design traction for the actual environment. Then allow the coating system to cure before putting the floor back to work.

Technical specifications can change. Always consult the latest BG Coatings Technical Data Sheet, Application Guide and Safety Data Sheet for the selected product before specification or application.