painting tips for canal boats
expert advice from rylard paints
When choosing colours, ensure that comparisons are undertaken in daylight. It is always advisable to compare colours with a painted boat as it is difficult to appreciate the colour in large areas. Our printed colour charts have accurate colour rendition but the enamel will appear to be lighter when applied to large areas, especially when adjoining complementary colours.
Where possible, ensure that you have the same batch number for the finish coats.
Weather conditions play an important part when painting outside. Avoid if possible painting in direct sunlight or when the boat is obviously warm to the touch. The ideal temperature for painting is between 12oC and 20oC. Higher temperatures could result in poor flow, rapid drying and loss of gloss. Windy conditions will lead to dirt pick-up and faster drying. Do not apply in damp conditions and aim at finishing painting by mid-afternoon, as overnight condensation may affect the finish.
Drying times will vary considerably depending on conditions, but at 20oC in still air, light touch-dry for both undercoats and topcoats will be 1 to 3 hours, and through-drying will be 12 to 24 hours. If possible, longer drying times should be allowed before overcoating as this will make rubbing down easier. Where low temperatures are experienced and there is little air movement, drying times can be as much as doubled, so take this into account when judging when to apply the next coat.
A dust-free environment is essential to obtain a really good gloss finish. The removal of dust prior to painting is essential, and dust and debris must be removed between the sanding of each coat and the application of the next.
Rylard Plus Enamel has a high pigment level and therefore thorough stirring is necessary. Best results are achieved with a wide flat-ended blade or a piece of clean, flat-ended wood. Screwdrivers are not efficient for stirring! It is advisable not to wear loose or woollen clothing when painting as this can contaminate the freshly painted surfaces.
PREPARATION OF SURFACE
Preparation: For best results, steel should be blast cleaned. This is not always possible, so alternatively mechanical cleaning by sanding and wire brushing can be undertaken to remove any rust.
Cleaning: The surface should then be thoroughly degreased using a water based or water dispersible degreaser, which must then be thoroughly washed off. Solvent cleaning is only efficient if clean wiping cloths are frequently replaced, otherwise the solvent just spreads the grease or oil around without removing it. Any remnants of grease or oil will affect paint adhesion and can cause slow drying and tackiness of the paint. Do not use diesel, paraffin or turps substitute for cleaning as they promote rust – white spirit is preferred.
Priming: The hull above the water line should then be coated with 2 coats of Rylard Zinc Phosphate Primer. If it is to be left outside for any length of time before applying finishing coats, 2 coats of Rylard Holding Coat are essential to prevent rust spotting.
PREVIOUSLY PAINTED SURFACES
Rusted areas should be abraded down to clean steel and existing paint edges feathered to prevent ridging showing through. All clean metal areas should be patch-primed with 2 coats of Rylard Zinc Phosphate Primer.
Should rusting be extensive, consider having the boat blast cleaned and professionally repainted for long-term protection.
Where there have been feature lines, names, etc., ensure that these are completely removed to prevent shadowing-through.
If there is general unevenness and poor feathering, several coats of Rylard Primer/Filler should be used, abrading between coats to give an even surface. Rylard Primer/Filler can be used directly onto small patch areas.
Rub down the surface overall to an even matt finish using 320 grit wet and dry paper. If a colour change is to be undertaken, the relevant undercoat colour should be used.
Apply the paint using a good quality 2½” to 3” brush. Gloss rollers and pads can also be used. To ensure even application, apply by crossing brush strokes before laying-off. On boat sides, always lay-off with vertical strokes. With large areas such as cabin tops, best results can be obtained by two people applying to prevent loss of wet edge – one person applying, the other laying-off. When brushing, it is recommended that the brush is held at 45 degrees to minimise brush marking. Where masking tape is being used, it is recommended that this is removed before the paint has reached a light touch-dry state, as this will ensure a smoother edge.
Clean brushes regularly (about every 20 minutes), to prevent thick build-up of paint in the brush. Stir the paint regularly during application.
Except for the primer, rub down with 320 or 360 grit wet and dry paper between coats, to ensure a completely smooth, even finish. When using wet and dry paper, always use it wet, and occasionally apply domestic soap to the paper, as this will prevent blocking and aid abrading. (‘Blocking’ is build-up of paint debris on the paper, which may cause scratching of the paint film).
Wipe over thoroughly after abrading, as dust and debris will affect the final appearance. The smoothness of the finish is ultimately dependent on the preparation, especially for Undercoats and Primer/Filler. Where coarse profile steel has been used, or where underlying imperfections in the surface exist, extra coats of Primer/Filler and Undercoats should be used.
Under normal circumstances thinning of the paint is not necessary, but where application is undertaken at low temperatures, or previously used paint has bodied in the can due to evaporation, small quantities of recommended thinners can be used.
Rylard primers, undercoats and topcoats can be applied by air assisted or standard airless spray. Thinning may be necessary dependent on the spray equipment used, please consult the relevant Product Data Sheet.
TRADITIONAL and POLYURETHANE VARNISHES
Bare new wood should be sanded using either sandpaper or wet & dry paper, finishing with a 180 grit paper prior to applying the varnish. Ensure that all sanding dust is removed by either brushing or vacuuming before applying any varnish coats. The use of a tack cloth to remove any residual dust may also be used.
It is essential that any new oily wood, such as teak, is degreased using white spirit or cellulose thinners in order to improve penetration and adhesion. However, it should be noted that Polyurethane Varnish is NOT recommended for use on oily woods such as teak. The first coat of varnish should be thinned – 1 part varnish to 1 part of white spirit – and thoroughly stirred. Brush this coat well into the pores of the wood to ensure full sealing. After drying, sand smooth to remove the timber ‘nibs’ using a 320 or 360 grit wet & dry paper.
EXISTING VARNISHED SURFACES
If the existing varnished surface is in poor condition and is showing flaking or other imperfections, it is recommended that it is removed back to bare wood (using either a proprietary paint stripper or sanding) and the timber treated as for New Wood. If the existing varnish is in sound condition, rub down with a 320 or 360 grit wet and dry paper and clean with white spirit.
To obtain a good depth of gloss on both new wood and existing varnished surfaces, a multiple-coat treatment is recommended, with a minimum of 3 coats, with light rubbing down between coats using either a 320 or 360 grit wet and dry paper. Note: Rylard eggshell varnishes are not suitable for exterior surfaces.
SLIP RESISTANT DECK PAINT KIT
Rylard Slip Resistant additive can be used with all Rylard topcoats.
Thorough mixing must be ensured to obtain an even dispersion of the fine aggregate.
Care must be taken to ensure brush marks are not apparent.
All Rylard topcoats are suitable for sand-blinding, but care must be taken to ensure the sand is thoroughly dry.
- To obtain the cabin length deduct the length of the bow and the stern from the overall length of the boat
- Deck area should be approximate to window area and has been allowed for in the above calculations
- On bare steel 2 coats of Rylard Zinc Phosphate Primer should be used at a similar coverage rate to the topcoat
- All figures are approximate and given for guidance only
Rylard Paints is a well-respected name in the supply of paints for canal boats, narrow boats, dutch barges and leisure craft. Through its Research and Development program Rylard continues to provide state-of-the-art products, manufactured in the UK to the highest Quality standards. We provide a range of coatings for canal boats, from blacking to topsides, anti-slip for decks and roofs, to brass lacquer to keep metal fitments glowing.