Portable Plural-Component Coating Systems for Contractors

Article 05 of 24

Reading Product Data Sheets, Manuals, and Project Specifications

The contractor must convert several different technical documents into one safe, workable, and verifiable field procedure. Missing one limitation, using an outdated revision, or assuming that one document replaces another can compromise the entire installation.

The Central Principle

The project specification defines what the completed work must satisfy. The coating manufacturer explains how the material must be stored, mixed, applied, and cured. The equipment manufacturer explains how the machine must be configured, operated, flushed, and maintained. The contractor must reconcile all three before work begins.

Learning Objectives

After completing this article, you should be able to:

• Distinguish a specification, product data sheet, safety data sheet, and equipment manual
• Identify the critical information required before plural-component application begins
• Recognize conflicting, missing, or outdated requirements
• Calculate preliminary wet-film thickness and theoretical coverage
• Prepare an RFI when written requirements do not agree
• Create a controlled field-document package for the crew

The Safety Data Sheet Is Not the Product Data Sheet

The safety data sheet communicates chemical hazards, protective measures, first aid, fire response, handling, storage, exposure controls, physical properties, stability, and other safety information.

It normally does not provide the complete surface preparation, mixing, spray setup, film thickness, recoat, cure, or inspection requirements needed to install the coating properly. Contractors need both documents.

The Project Document Stack

Document Priority Must Come From the Contract

There is no universal rule stating that a product data sheet automatically overrides a project specification or that an approved submittal automatically changes the contract. The contract documents should establish order of precedence and the procedure for resolving conflicts.

When documents conflict, stop and obtain written clarification from the party authorized to interpret the project requirements. Do not allow a field conversation to become an undocumented specification change.

Reading the Project Specification

Before bidding or mobilizing, identify:

• The exact surfaces and limits of work
• Required coating manufacturer, products, colors, and system sequence
• Permitted substitutions and approval procedure
• Required substrate repairs and surface-preparation standards
• Environmental and moisture limitations
• Required thickness for each coat and total system
• Stripe coats, reinforcement, aggregates, details, and termination requirements
• Inspection methods, frequency, hold points, and acceptance criteria
• Mockups, test areas, adhesion tests, or qualification requirements
• Documentation, warranty, maintenance, and closeout requirements
• Who has authority to approve changes and accept the finished work

Reading the Product Data Sheet

Locate and record the following for each component and coating layer:

Read the Footnotes and Limitations

The most important requirement may appear in a footnote, limitation, temperature chart, application note, or separate bulletin. Do not stop reading after finding the mix ratio and recommended spray tip.

Reading the Safety Data Sheet

OSHA's required safety-data-sheet format contains 16 numbered sections. Sections 1 through 11 and Section 16 contain information required under the Hazard Communication Standard. Contractors should review the complete SDS, with particular attention to:

• Section 1: Product and supplier identification
• Section 2: Hazard identification, signal word, pictograms, and precautionary statements
• Section 3: Composition and hazardous ingredients
• Section 4: First-aid measures
• Section 5: Firefighting measures
• Section 6: Accidental-release measures
• Section 7: Handling and storage
• Section 8: Exposure controls and personal protection
• Section 9: Physical and chemical properties
• Section 10: Stability, reactivity, and incompatible materials
• Section 11: Toxicological information
• Section 16: Revision date and other information

Review the SDS for every component, primer, cleaner, thinner, flushing material, repair product, and topcoat—not just the primary coating.

Reading the Equipment Manual

Confirm that the equipment can satisfy the coating requirements without exceeding any component rating. Review:

• Approved uses and prohibited uses
• Available ratios and ratio-adjustment method
• Maximum working pressure and maximum fluid temperature
• Maximum and minimum output
• Wetted-part, seal, hose, and material compatibility
• Electrical, pneumatic, hydraulic, and grounding requirements
• Feed-pump and supply requirements
• Heater and heated-hose capability
• Mixer, manifold, gun, chamber, tip, and nozzle requirements
• Calibration and ratio-verification procedure
• Alarm limits and required operator response
• Flushing, pressure relief, shutdown, and storage procedures
• Inspection and preventive-maintenance intervals

The Lowest-Rated Component Controls

A system's allowable working pressure and temperature are limited by the lowest-rated component in the complete fluid path. This includes pumps, heaters, filters, valves, manifolds, hoses, swivels, fittings, guns, mixers, tips, and accessory equipment.

Installing a higher-pressure pump does not increase the rating of a hose, fitting, heater, or spray gun. Never operate the complete system above its lowest applicable rating.

Preliminary Wet-Film Thickness Calculation

When the product data sheet provides volume solids and target dry-film thickness, a preliminary wet-film target can be estimated:

Wet-film thickness = Required dry-film thickness ÷ Volume-solids fraction

For a coating that is 80% solids by volume with a required dry-film thickness of 16 mils:

16 mils ÷ 0.80 = 20 mils wet

This is a theoretical starting point. Permitted thinning, reaction, application method, surface texture, overspray, absorption, sag resistance, and manufacturer-specific behavior can affect the relationship. Use the manufacturer's published wet-film range when provided.

Preliminary Theoretical-Coverage Calculation

One U.S. gallon theoretically covers approximately 1,604 square feet at one mil wet-film thickness. When volume solids and required dry-film thickness are known:

Theoretical square feet per gallon = 1,604 × Volume-solids fraction ÷ Required dry-film thickness

For an 80%-volume-solids coating applied at 16 mils dry:

1,604 × 0.80 ÷ 16 = approximately 80 square feet per gallon

This is theoretical coverage. Actual material consumption must account for surface profile, porosity, irregular geometry, overspray, material retained in equipment, startup and flushing losses, test panels, waste, repairs, weather, operator technique, and required minimum thickness.

Do Not Bid from Theoretical Coverage Alone

Theoretical coverage assumes a perfectly smooth surface, uniform thickness, no overspray, no waste, and no material remaining in the equipment. Those conditions do not exist on an actual contractor project.

Check the Revision Date

Product formulations, equipment designs, test standards, exposure information, and application instructions can change. The contractor should record the document title, revision number, publication date, and date obtained.

Do not assume that a data sheet saved from a previous project remains current. Obtain the current documents from the manufacturer or authorized project source and preserve the versions used for the completed work.

Resolve Conflicts with a Written RFI

A useful request for information should:

1. Identify the exact drawing, specification, data sheet, or manual section
2. Quote or accurately summarize the conflicting requirements
3. Explain the field or performance consequence
4. Ask a direct question that can receive a direct answer
5. Identify any schedule or cost effect
6. Request written direction from the authorized party

Build a Controlled Field Package

The crew should receive a controlled package containing:

• Approved specification sections, drawings, details, and addenda
• Approved submittals and RFIs
• Current product and safety data sheets for every material
• Current equipment manuals and setup instructions
• Approved method statement and inspection plan
• Calibration, ratio-check, environmental, thickness, and inspection forms
• Emergency contacts and spill-response information
• A revision log identifying the current document versions

Remove superseded documents from active use. Marking an old sheet “obsolete” is not enough if it remains beside the proportioner where an operator can follow it by mistake.

Preapplication Document Review

Before mobilization, confirm in writing:

• The coating system is approved for the exact service
• The equipment can maintain the required ratio, temperature, pressure, and output
• The substrate-preparation requirement is achievable
• Environmental and moisture limitations can be maintained
• Required inspectors, hold points, and testing equipment are available
• Required utilities, ventilation, containment, and PPE are included
• Required cure and return-to-service periods fit the project schedule
• All unresolved conflicts have received written direction

Key Takeaways

• Specifications, data sheets, safety data sheets, and equipment manuals serve different purposes
• The contract establishes how conflicting documents are resolved
• The SDS does not replace the product data sheet
• The equipment manual must be reviewed with the coating requirements
• The lowest-rated component limits the complete fluid system
• Theoretical coverage must be adjusted for actual project losses
• Document revision dates must be controlled
• Conflicts require written clarification—not field assumptions

Technical References

• OSHA 29 CFR 1910.1200 Appendix D—Safety Data Sheets: The required safety-data-sheet sections and information structure. View the OSHA requirement
• ASTM D4414—Standard Practice for Measurement of Wet Film Thickness by Notch Gages: Use of notched gages for approximate wet-film-thickness measurement. View the ASTM standard page
• ASTM D7091—Standard Practice for Nondestructive Measurement of Dry Film Thickness: Gage adjustment and nondestructive dry-film measurements over ferrous and nonferrous metal substrates. View the ASTM standard page
• SSPC-PA 2—Procedure for Determining Conformance to Dry Coating Thickness Requirements: AMPP procedure for determining whether coating thickness conforms to a specified range on metal substrates. View the AMPP standard page
• WAGNER TwinControl Electronically Controlled 2K Systems Operating Manual: Equipment identification, limits, assembly, grounding, calibration, operation, flushing, maintenance, troubleshooting, and accessories. View the official equipment manual

Use the editions and revisions required by the contract documents. Verify all standards, product literature, safety documents, and equipment manuals before bidding, mobilization, and application.

Professional responsibility: Do not begin application when the specification, approved system, product instructions, safety requirements, or equipment limitations conflict. Submit a written RFI and obtain written direction from the party authorized to resolve the conflict.

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