Surface
preparation requirements
Surface preparation is one of the keys to a successful painting
job, no matter what coating is being applied. Whether the coating
is solventborne or waterborne, surface preparation is not an area
to cut corners. However, there are some differences in surface
preparation requirements between solventborne and waterborne coatings,
as follows:
• Contamination of a surface with grease
or oil can lead to problems for a waterborne coating, which
may not wet out a greasy surface. This could lead to adhesion
problems. Solventborne coatings are usually more forgiving over
these types of surfaces, as the carrier solvent can often help
dissolve the grease or oil contamination. A solvent wipe to
remove the contamination should be used if applying waterborne
coatings.
• Waterborne acrylic coatings applied
direct to a metal surface perform best over more highly cleaned
steel. Where possible, abrasive blasting to a minimum of a SSPC
SP-6 specification (Commercial Blast Cleaning) is preferred.
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