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.
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
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