Onboard Maintenance Painting Guide - International Marine Coatings

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Introduction and planning Surface preparation Paint application Health and safety Surface preparation The single most important function which can influence paint performance is the quality of the surface preparation. The importance of removing oil, grease, old coatings, rust and other surface contaminants cannot be over stressed. The following process is recommended: • Freshwater wash – to remove all salt contamination. This is best achieved using something like a fan jet lance or a power washer if available • Degrease – to remove all surface grease and oil. This is usually done using rags or brushes soaked in solvent. If a painted surface is to be degreased without being damaged, a solvent must be chosen which will not dissolve the paint film. Freshwater washing 4 Marine Coatings All products supplied and technical recommendations given are subject to our conditions of sale. OBM Painting Guide • Steel preparation – For OBM, International® recommends that a standard of at least St2 thorough hand and power tool cleaning is achieved for bare steel areas. The existing coating should be taken back to a sound edge and the edges should be “feathered” back using a combination of manual methods: • Hard scraping or slicing – this is carried out with various types of scraper. Scrapers are useful for removing loose material. • Chipping hammers or chisels – chipping can be carried out using a wide variety of hammers or chisels, best results are obtained if chipping is followed by secondary preparation such as wire brushing. • Wire brushing can remove loose contamination, but it is ineffective at removing scale and deep seated corrosion. Hard scraping
Power tool methods of surface preparation Power tools used for cleaning fall into two basic categories – rotary cleaning tools and impact cleaning tools. • Rotary wire brushing using “braided” wire wheels Radial brushes are used for preparing awkward areas such as corners or weld seams. Cup brushes are more often used for preparing large areas. • Rotary discing cleaning of a surface is achieved by coated abrasive discs attached to angle grinders or by using abrasive flap wheels attached to straight or in-line tools. Rotary wire brushes For both rotary wire brushing and rotary discing, the surface must not be polished and it is essential that a surface profile is created. • Clean down – The prepared area should have any residual dust, paint flakes and debris removed by brushing or vacuuming. Paint application should begin as soon as possible after cleaning to prevent deterioration of the prepared surface. Rotary discing 5 Introduction and planning Surface preparation Paint application Health and safety
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Onboard Maintenance Painting Guide - International Marine Coatings

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