Overcoating Paint Systems on Water Tanks -- Induron Protective Coatings

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  • Overcoating Water TanksJim Skilton & Jeff WhiteSouthern Corrosion & Induron Protective Coatings

  • OverCoating Paint Systems on Water Tanks

  • We never know the worth of water till the well is dry.

    -English Proverb

  • 38% OF EXISTING INDUSTRIAL STEEL HAS BEEN COATED WITH LEAD-BASED PAINT INCLUDING OVER 51,000 WATER TANKS.

  • Check Adhesion and FilmIntegrity What is the total film thickness? How many coats of paint? How good is the adhesion to the substrate and between coats? Are there film defects such as cracking or blistering?

  • Degree of Rusting ASTM D 610 Evaluating Degree of Rusting on Painted Steel Surfaces Less Than 10% Rusting

  • Clean, Dry & Free of Contaminants Power Washing with Detergent Spot Power Tool Cleaning- SSPC-SP3- SSPC-SP11 Surface Preparation for Overcoat Systems

  • Surface Preparation for Overcoat Systems

  • Evaluate the Degree of Rusting Evaluate the Adhesion & Film Integrity Determining the Condition of the Existing Paint System

  • The condition of the existing coating system The surface preparation prior to overcoating The geographic location (exposure conditions) The type of overcoat system selected Selecting a knowledgable, experienced contractor Owner expectationsFactors that Determine Overcoat Success

  • Selecting a Successful Overcoat System

  • DETERMINING THE DELAMINATION RISK FACTORDelamination Risk FactorThe degree of risk associated with the existing coating system delaminating between coats, or from the substrate after application of an overcoat system taking into account freeze/thaw cycling and total film thickness of the existing system.

  • DELAMINATION RISK FACTOR

  • COHESIVE STRESS FACTORS

  • SELECTING CANDIDATEOVERCOAT SYSTEMSDelamination Risk Factor

  • Adhesion / Film Integrity+Geographic Location+Existing Film ThicknessDELAMINATION RISK FACTOR

  • Delamination Risk Factor+Cohesive Stress FactorCANDIDATE OVERCOAT SYSTEM

  • Candidate Overcoat System+Test Patch EvaluationSUCCESSFUL OVERCOAT SYSTEM

  • Excellence is not an act, but a habit-Aristotle

  • Question? Comments? Discussions?

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