Self-painting is not just a way to save money, it's also a way to get a result that is fully consistent with personal aesthetic preferences. A well-designed coating protects the body from the aggressive effects of salt or fresh water, ultraviolet rays and mechanical damage. Many owners underestimate the importance of surface preparation, which is the stage that determines 90% of the success of the entire operation and the longevity of the finish layer.
The process of updating the appearance of the boat requires patience, the right choice of materials and compliance with temperature. Errors during the priming stage or degreasing ignition can lead to peeling of paint after the first season of operation. In this article, we will discuss all the nuances of working with different types of materials to make your boat look like new.
Before you start purchasing consumables, you need to clearly define the type of material from which your case is made. aluminum-alloyAnd the wrong chemistry can react with the base, causing corrosion or destruction of the material's structure in a matter of weeks.
Selection of paint type depending on the material of the body
The market of paints for water engineering offers a wide range of specialized formulations. fiberglass The most common type of hulls are two-component polyurethane enamels, which create an incredibly strong and glossy surface. Aluminum boats require compounds with anti-corrosion additives to prevent the metal from oxidizing when in contact with water.
Particular attention should be paid to the paints with antifoulingIf you plan to keep the boat in the water for a long time, these coatings contain biocidal additives that are toxic to microorganisms, algae and shells, preventing them from gaining a foothold on the bottom, but it is worth remembering that these compounds have a limited lifespan and require periodic renewal.
⚠️ Warning: Never use conventional car or building paints to paint the underwater part of the body. They do not have the necessary elasticity and adhesion in the aquatic environment, which will lead to rapid bloating and peeling.
It is also important to consider practicality when choosing a color: light colors are less heated in the sun and visually hide small scratches, whereas dark shades require perfect surface preparation, as they show any defect. Dark blue and black colors on the bottom burn out faster and heat up more, which can accelerate the degradation of the paint binder.
Required tools and materials for the job
You can't have a good result without the right tools. You're going to need not only the paint, but you're going to need a whole arsenal of auxiliary preparation and application tools. It doesn't make sense to save on consumables, because cheap brushes can climb, and low-quality solvents can degrade enamel properties.
To work with double-component You need to have the correct balances to mix the components in the right proportions, and a violation of the ratio of the hardener to the base will either cause the paint to not dry, or become too brittle and crack.
- 🛠️ Grinder. (orbital or vibrational) with a set of abrasives of different grains.
- 🧪 Degreaser (Specialized silicone remover or acetone).
- 🖌️ Krascopult (compressor or electric) with nozzle diameter 1.3-1.5 mm for finishing layers.
- 🧤 Personal protective equipment: respirator with carbon filters, gloves, protective suit.
Don't forget to use paint tape and cover film if you're planning to paint the boat partially or make a complex design with a transition of colors, and you'll also need putty to remove deep chips and dents before you start the main work.
Surface Preparation: A Key Stage of Success
Surface preparation takes up to 70% of the time, and this stage is absolutely impossible to ignore. First, you need to thoroughly wash the case, removing all dirt, mud, oil and salt deposits, and for this, it is best to use special detergents for boats or a weak solution of alkali.
After the washing, the old coating, if it is not maintained properly, must be completely removed. matted Abrasive P240-P320 to allow the new layer to bond to the base, and the deep scratches and chips are sealed and aligned.
☑️ Checklist for hull preparation
The final touch of the training is degreasing, and even if the surface seems clean, there may be invisible fat spots left on it from your hands or polishes. solvent 646 Or a specialized antisilicone, using lilac-free wipes, and immediately start priming until the dust has settled back.
Technology of applying primer and paint
The ground is the foundation for paintwork, the aluminum is acid or epoxy, the fiberglass is epoxy or polyurethane, the soil is applied in thin layers, avoiding stains, between the layers must withstand the interlayer drying time specified by the manufacturer.
Painting is best done in a room with a temperature of +15 to +25 °C and low humidity, applied by wet to wet or intermediate grinding, depending on the type of material. uniformity scattering the previous pass by 50%.
| Type of material | Recommended soil | Type of paint | Drying time (at +20°C) |
|---|---|---|---|
| Fiberglass | epoxy | Polyurethane enamel | 12-24 hours |
| aluminum | Acid/Epoxy | Alkyd/Polyurethane | 6-12 hours |
| Steel | Zinc-filled | epoxy enamel | 24 hours. |
| Tree. | Oily/Alkyd | Yacht lacquer/Enamel | 24-48 hours |
If you use a two-part system, mix as much paint as you can produce in 2-3 hours, because the viability of the finished mixture is limited. After this time, the paint in the jar will begin to thicken and become unsuitable for application, forming lumps.
What to do if there are smacks?
If the undertone is detected immediately, it can be neatly removed with a soft brush dipped in a solvent. If the paint has already begun to grasp, leave it until full polymerization, then grind the defect with abrasive P1000-P1200 and locally paint the place.
Protection of underwater part and anti-fouling
For boats that are constantly in the water, protecting the fouling part is critical. Biofouling not only worsens the appearance, but also significantly increases the water resistance, leading to fuel overruns and reduced speed. Anti-fouling paints (anti-fowlings) create a layer that gradually breaks down in the water, taking with it attached organisms.
There are different types of antifowlings: self-pollinating, hard and copper-based. Copper-containing paints can not be used on aluminum cases without a special insulating layer, as a galvanic pair will appear, and aluminum will begin to actively corrode.
- 🌊 Self-pollinating Ideal paints for high-speed vessels, as they create a smooth surface.
- 🛡️ Hard. The coatings are suitable for boats that are often taken out of water or stored on land.
- ⚓ Granulated compositions create a rough surface to which it is difficult to attach to shells.
⚠️ Warning: When applying antifouling paint on board above the waterline, be careful. Many of these compounds are not resistant to ultraviolet light and can change color or collapse in the sun.
Drying, polishing and finishing work
The full polymerization of the paint can take anywhere from a few days to several weeks, depending on the chemical composition. Although the surface can be dry to the touch after a day, the final hardness and chemical resistance it gains later, during which time it is not recommended to launch the boat into the water or subjected it to mechanical stress.
Once completely dry, you can polish the surface to remove the shagrene skin (orange peel) and give it a deep shine, using polished pastes of different abrasiveness and a polishing machine with a soft circle, which also helps to level the transitions between the layers.
Use only polished pastes designed for car or yacht varnishes. Metal abrasive pastes can leave deep scratches on the paint layer.
The final step is to install attachments that have been dismantled before painting. Make sure all fasteners are cleaned of paint to avoid problems with electrical contact or leaks. Check the condition of the transom assembly and update the sealant if necessary.
A high-quality painting of the boat yourself is possible only with strict observance of the temperature regime and surface preparation technology, and the haste at the sanding or degreasing stage will negate all further efforts.
Frequently Asked Questions (FAQ)
Can I paint a boat in the winter in an unheated garage?
No, most paints require temperatures above 15°C for normal polymerization; at low temperatures, the paint may not dry, cloud or crack; and high humidity in winter can lead to condensation under the paint layer.
How many layers of paint do you need to apply?
The optimal application is 2-3 layers of soil and 2-3 layers of finish enamel. The exact amount depends on the cover of the particular paint and the desired color. Too thick layer can lead to wrinkling of the coating.
Should I remove the old paint if it is holding well?
Complete removal is required only if the old coating flakes off or has deep damage. If the layer is strong, it is sufficiently carefully grinded (wrapped) until the gloss is lost, degrease and apply a new layer on top.
Which is better to paint: brush or spray gun?
The Krascopult gives a smoother, factory surface without stripes, especially in large areas. It is convenient to paint hard-to-reach places or small areas with a brush or roller, but it is more difficult to achieve the perfect gloss, there may be traces of pile or joint.