Onboard Maintenance Painting Guide - International Marine Coatings

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Introduction and planning Surface preparation Paint application Health and safety Paint application Paint mixing Before use, paints should be mixed well, following the instructions on the technical data sheet. • Thinning – thinning of paint is not recommended. Follow the guidelines on the technical data sheet. • Film thickness – it is important to apply the specified wet film thickness. This should be measured using a comb gauge. Wet film thickness should be measured with a comb gauge Brush selection Application by brush is recommended for patch priming and repair work to ensure good wetting of the substrate. This is essential when painting over manually prepared surfaces. • The choice of brush will depend upon the application required and the quality of finish to be achieved. • Flat square end brushes, often called wall brushes, are used on flat areas. Angular cut ‘sash’ brushes 2” - 3” (5cm - 8cm) wide are used on narrow surfaces, and round or elliptical section brushes are used on irregular shapes such as nuts and bolts. • Brushes with angled heads and long handles are used for painting the backs of stiffening bars and other inaccessible areas in tanks. 6 Brush application Marine Coatings All products supplied and technical recommendations given are subject to our conditions of sale. OBM Painting Guide • Brushes should not be dipped into the paint more than half the length of their bristles, the aim is to load the brush with enough paint to get some work done, but not too much so the paint drips and splatters. • The applied paint should spread evenly using smooth, steady strokes then be smoothed by light parallel strokes to eliminate irregularities. • On flat, vertical surfaces, it is best to finally lay off the paint in a vertical direction because this will reduce the tendency of the paint to run or sag. • Applicators should either be advised to apply a single “thick” coat or multiple thin coats which can be applied when the paint is touch dry if the area is accessible. • Particular attention should be paid in ensuring that the applied paint is brushed into the bottom of pitted areas of steel and that the edges of nuts, etc are well coated. Flat and round ended paint brushes The brush should be held like a pencil
Roller selection • Rollers are useful for applying paint to large flat areas such as tank tops, vertical sides, walkways and deck areas. • A short bristled brush is more practical for badly pitted and rough steel, because paint can be worked into the profile of the steel. • Roller application requires less skill from painters than brush application. • The most common roller fabrics used are lamb’s wool and mohair. Synthetic foam rollers have no role to play in the marine industry, they are prone to dissolve in the type of solvents used in heavy duty coatings and can swell and distort. • Roller covers vary in diameter, length, type of fabric and fibre length. Small diameter rollers are used for areas of awkward or difficult access, but the most common sizes are 1½” - 2” (4 - 5cm). Length can be anything from 1” to 18” (2.5 - 46cm), but the 9” length (23cm) is most popular. Roller application • Pitted areas should be touched up by brush before roller application. • Immerse the roller into the paint tray, roll it in the paint until fully saturated, and then roll it back and forth on the tray ramp to remove all excess material. • This not only avoids the problems of drips and splatters, but ensures that the roller is fully wetted and that air is removed from the fibre pile. Roller sleeves Roller application • Paint should then be applied to the surface by forming a ‘W’ or ‘M’ shape in the area to be coated. The ‘W’ or ‘M’ shape area should then be filled by rolling back and forth until it is covered, with finished rolling in one direction so that appearance is uniform. • It is difficult to achieve high thickness in single coats; multiple applications can be required to meet specifications. • Over rolling can cause paint pick-up, particularly with fast drying coatings. This is often associated with serious entrapment of air. • An alternative to using paint trays is to put a roller grid in the paint bucket or paint tin and work out excess material on this. This can allow the painter to work from ladders or scaffolds. 7 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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