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Surface Preparation

surface preparation

The Effect of Surface Preparation on Coating Performance

Prediction of service life for naturally exposed coatings remains problematic. A number of factors can have an effect on coating performance, but none more so than surface preparation, the primary factor that influences how long a coating will last in service. A method of surface preparation must be selected based on coating type, the intended …

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hand tool cleaning

Brushed Off: Latest Contractor Tools for Performing Hand Tool Cleaning

As seen in the Fall Edition of PaintSquare Press News The Surface Preparation Hand Tool Cleaning Standard (SSPC-SP 2) was first published as a temporary specification in August 1952 (SSPC-SP 2-52T), only two years after the Steel Structures Painting Council was founded (1950). The standard was developed primarily for maintenance of existing coating systems when …

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abrasive blast cleaning

Abrasive Blast Cleaning of Non-Ferrous Metals

Most of the SSPC surface preparation standards focus on the preparation of steel, either by abrasive blast cleaning (dry and wet), power tool cleaning, or water jetting.  Recognizing that galvanizing, non-ferrous metals and various types of stainless steel also need to be prepared for painting, SSPC published a standard for brush-off blast cleaning these metals …

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Preparation of Edges for Coating Performance

Introduction Over 2,000 years ago, the Greek philosopher Aristotle discovered (or uncovered) the fact that our world wasn’t flat. While the earth itself is round, the topography of what is on this earth is neither flat nor round, but rather highly variable, with hills, valleys, mountains and plains. Similarly, our industrial infrastructure is far from …

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failure paint to hot dip galvanizing

Preparing Hot Dip Galvanizing for Painting – It’s not Overly Complicated

Bare galvanizing provides excellent corrosion protection at a pH between 7 and 13, but corrosion of the zinc increases as the pH becomes more acidic (less than 7), or more alkaline (greater than 13).  When galvanizing is exposed to the lower or higher pH ranges, it should be painted.  Paint should also be applied when …

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surface preparation to primer prep-to-prime

Window of Time – Surface Preparation to Priming

Introduction Coating specifications and contract documents often contain stipulations for the maximum length of time a prepared steel surface can remain uncoated. We’ll refer to this as the “prep-to-prime window.” This brief article highlights common requirements, discusses the purpose of the requirements, presents industry references, questions the variability in the time periods, and explores a …

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surface soluble salts

Surface Soluble Salt Measurement – Conductivity Verses Ion-specific Methods of Analysis

Chemical contaminants on a surface can include chlorides, ferrous ions, sulfates and nitrates, among other types of soluble salts. Chloride may come from deicing materials or marine/coastal environments, ferrous ions are a by-product of corrosion, sulfates can be airborne, particularly in industrial environments (e.g., coal-fired power plants) and nitrates may come from the soil (e.g., …

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jobsite surface cleanliness standards

The Importance of Preparing Jobsite Standards for Surface Cleanliness and Surface Profile Depth Prior to Production Operations

Introduction Surface preparation prior to coating installation is generally composed of two goals: achieving the minimum specified surface cleanliness, and achieving the specified range of surface profile (surface roughness). While these goals may be achieved in a single operation (e.g., by abrasive blast cleaning) or two separate operations (e.g., by water jetting or chemical stripping, …

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coating edges

Challenges Encountered with In-Process Cleaning and Painting of Buildings

There are many challenges associated with cleaning and painting commercial buildings. Questions often arise regarding surface preparation, application and final thickness or appearance. Three of the many questions our consultancy group has encountered during the cleaning and painting of buildings are addressed in this article. The questions should be familiar situations to those in the …

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sspc visual guides

How to Use SSPC Vis Guides in Practice

SSPC has published four visual guides that depict the different degrees of cleaning for dry and wet abrasive blast cleaning, water jetting, and hand/power tool cleaning.  Two of the four were prepared jointly with NACE International (Figure 1). The guides are: SSPC-VIS 1, Guide and Reference Photographs for Steel Surfaces Prepared by Dry Abrasive Blast …

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