How to Read an Industrial Coating Product Data Sheet

A coating product data sheet tells you where a coating can be used and how it must be prepared, applied, and cured. For facility owners comparing painting contractors, it's a way to understand what a proposed coating job includes.

The most useful numbers describe conditions , not just performance. A product that fits your exposure may still require preparation or curing time that affects your budget and schedule.

Start by separating the product's application instructions from its safety information.

Key Takeaways

• Match the coating to the substrate and the actual service, including chemicals, traffic, sunlight, or immersion.
• Compare the complete system, including preparation, coat sequence, thickness, and cure time.
• Treat theoretical coverage as a starting calculation, not a purchase quantity.
• Use the product data sheet alongside the safety data sheet and the project specification.
• Include inspection methods and records in the contractor's scope.

Product Data Sheet vs. Safety Data Sheet

A product data sheet, often called a technical data sheet or PDS, describes how a coating is intended to perform and how to apply it. It may identify suitable substrates, preparation standards, application equipment, film thickness, coverage, and curing conditions.

A safety data sheet, or SDS, addresses hazards and safe handling. It includes information about protective equipment, ventilation, storage hazards, emergency measures, and disposal. A two-component coating can have separate safety information for its components.

You need both documents. The PDS helps define the coating work; the SDS helps identify precautions for people handling the materials. Neither replaces a project specification that sets the approved system and inspection requirements.

Match Recommended Uses to Your Facility

The recommended uses section is the first filter. It may describe a product as suitable for structural steel, concrete, equipment, tank exteriors, or another application. The substrate alone, though, doesn't describe everything the coating will face.

Look at the actual exposure

A floor exposed to forklift traffic needs different properties than an exterior tank wall. Likewise, occasional chemical splashes create a different service condition than continuous immersion.

For chemical exposure, the substance, concentration, temperature, and contact duration matter. A general claim of chemical resistance doesn't establish suitability for every chemical or cleaning agent. Our guide to wastewater facility coating systems explains how exposure can vary within one facility.

Read limitations with the recommended uses

Look for restrictions on immersion, sunlight, temperature, or use over existing coatings. An epoxy, for example, may be part of a system that includes another product for exterior exposure.

The sheet may also list compatible primers and topcoats. A product's properties don't automatically apply to the entire assembly, including repair materials and joint sealants.

Understand Surface Preparation Requirements

Surface preparation affects whether the coating can bond to the substrate. A sheet may specify cleaning, removal of existing material, surface profile, moisture limits, or a recognized preparation standard.

Steel preparation

Steel may need degreasing, corrosion removal, and abrasive blasting. The required surface profile describes the texture left by preparation and helps the coating bond.

One recognized reference, SSPC-SP 10/NACE No. 2, describes near-white blast cleaning. Its presence on a sheet is a defined requirement for that use, not a rule for every steel project. Welds, sharp edges, and pitted areas may also need attention before coating.

Concrete and existing finishes

Concrete may require removal of oil, weak material, old sealers, or deteriorated coating. Cracks and spalls can require repair before application, using materials compatible with the coating system.

If an existing finish will remain, its condition and compatibility matter. A proposal that says only "clean and paint" leaves the preparation method and repair scope unclear.

Read Application and Mixing Instructions Together

The application section tells a contractor which methods the manufacturer permits and what conditions those methods require. Spray, roller, and brush application don't always produce the same film build or finish.

Application method and equipment

A sheet may list suitable spray equipment, tip sizes, pressure ranges, or thinning limits. It may also restrict brush or roller application to smaller areas or recommend additional coats to reach the required thickness.

Access and containment matter, too. Spraying a large tank near operating equipment may require overspray protection, while edges and welds may need separate attention. Our tank exterior coating guide covers application planning around Florida weather and facility operations.

Mixing and pot life

For a multi-component coating, the sheet identifies the required mixing ratio. It may also specify an induction time, the wait after mixing and before application.

Pot life is the usable time after components are mixed under stated conditions. Once it expires, adding thinner doesn't restore the coating's original working life. Mixing requirements affect batch size and how crews plan the work.

Know the Difference Between Wet and Dry Film Thickness

Film thickness is commonly listed in mils. One mil equals one-thousandth of an inch. The sheet may give a thickness range for each coat, while the project specification defines the approved system and acceptance criteria.

Wet-film thickness

Wet-film thickness, or WFT, is measured during application. A wet-film gauge helps the applicator judge whether enough material is going onto the surface before it dries.

The wet reading isn't the final thickness. Volatile material leaves the film as it dries or cures, so the dry coating is generally thinner than the wet coating. Thinning and application losses can affect the relationship.

Dry-film thickness

Dry-film thickness, or DFT, is the thickness after the coating has formed its dry film. Too little coating can leave inadequate protection. Too much can also cause product-specific drying or performance problems.

Don't compare a total-system measurement with a requirement for one coat. Our guide to measuring dry-film thickness explains how the substrate, gauge, and specification affect inspection.

Use Volume Solids to Interpret Coverage

Volume solids describe the proportion of a coating's volume expected to remain as dry film after volatile material leaves. The number helps connect wet-film thickness, dry-film thickness, and theoretical coverage.

Estimate wet and dry thickness

For a simplified calculation, multiply wet-film thickness by the volume-solids fraction. At 60% volume solids, a 10-mil wet film corresponds to approximately 6 mils of dry film.

That calculation assumes no added thinner or application loss. It illustrates the relationship between the numbers; it isn't a recommended thickness for a particular product.

Allow for material loss

Theoretical coverage is the calculated area a given volume can cover at a stated dry-film thickness. In U.S. units, the approximate calculation is:

Square feet per gallon = 1,604 × volume-solids fraction ÷ dry-film thickness in mils.

At 60% solids and 6 mils dry, the theoretical result is about 160 square feet per gallon for one coat. Actual coverage is lower when material is lost to overspray, surface roughness, equipment, or difficult geometry. Porous concrete can also take more coating than a smooth surface.

Distinguish Recoat Time From Full Cure

A product can reach several different stages after application. The sheet may list dry-to-touch, handling, recoat, and full-cure or return-to-service times. These milestones aren't interchangeable.

Recoat windows

The minimum recoat time is the earliest stated time for applying the next coat under the specified conditions. A maximum recoat time may also apply. Missing it can require additional surface preparation before the next layer.

Temperature often changes the timing, so use the row that matches the actual conditions. A schedule based on warm-weather drying may not work when the surface is cooler.

Return to service

A coating that feels dry may still need more time before traffic, cleaning, chemical contact, or immersion. Different service exposures can have different cure requirements.

For a short shutdown, account for preparation and application as well as curing. A coating's stated cure time alone doesn't describe the full time the asset will be unavailable.

Review Environmental Limits for Application and Cure

A sheet may set limits for air temperature, surface temperature, relative humidity, and the difference between surface temperature and dew point. It may also address ventilation or protection after application.

In Southwest Florida, steel in direct sun can be much hotter than the surrounding air. Morning dew and changing weather can also leave a surface too close to the dew point, even when it looks dry.

There is no single humidity cutoff for every industrial coating. Our guide to dew point during coating application explains why air and surface readings need to be considered together. Conditions also matter during the coating's vulnerable curing period, not only when work starts.

Read Storage and Shelf-Life Instructions

The storage section describes conditions for keeping the material before use. It may include a temperature range, shelf life, and instructions for unopened containers. Some products or components have different storage requirements.

Storage affects project planning when materials are ordered ahead or kept on-site. The SDS adds information about storage hazards and safe handling. For multi-component products, keep the component identification and batch information with the job records.

A Practical Checklist for Comparing Products

Compare proposed coatings as complete systems rather than choosing by product name or gallon price. Use the same surfaces and service conditions for each proposal:

• Identify the substrate and exposure, including chemicals, abrasion, sunlight, or immersion.
• Compare the required preparation, repairs, and treatment of existing coatings.
• List each product in the system, its coat sequence, and specified thickness.
• Review the application method, mixing requirements, and workable time after mixing.
• Compare coverage using the same dry-film thickness, with an allowance for actual losses.
• Account for recoat windows, cure conditions, and return-to-service timing.
• Include inspection methods, acceptance criteria, and records in the scope.

A lower bid may exclude containment, repairs, access equipment, or inspection. Our industrial coating inspection checklist covers the records that help document the finished work.

Choose a System That Fits the Work

A coating product data sheet gives you a practical basis for comparing proposals. The coating must fit the exposure, and its preparation and cure requirements must fit the facility.

At EFC Painting Contractors, we provide industrial coating services in Southwest Florida. A clear scope connects the product requirements to the work, schedule, and inspection the project needs.