The body of the Soviet D16AT aluminum alloy, from which the famous Kazanka motos are made, is highly durable, but requires constant maintenance. Aggressive aqueous environment, ultraviolet radiation and mechanical damage over time destroy the factory coating, opening the way for corrosion. Proper painting of the Kazanka boat yourself is not just an aesthetic procedure, but a necessary measure to extend the life of the boat.
Many owners face the dilemma of whether to take the case to a specialized workshop or take up the work themselves. surface And in terms of quality materials, home paint can outperform factory paint, and the key is to not save on drying time and follow the instructions for enamel.
In this article, we will discuss the whole process in detail: from the choice primer We're going to look at the nuances of working with aluminum alloys, which are very different from painting steel or plastic, and understanding the chemical processes of aluminum oxidation will allow you to avoid the typical mistakes when new paint is blown up after a month of use.
Selection of paint materials for aluminum housing
Aluminum is a reactive metal that reacts instantly with oxygen to form an oxide film, which protects the metal but prevents most paints from adhesion, which is why ordinary oil or alkyd enamels designed for ferrous metals are not suitable for Kazansk. supplementThey can penetrate through the oxide layer.
The most popular and time-tested solution is epoxy enamel, which creates a strong, chemically resistant coating that holds perfectly well on aluminum after proper preparation, and you can also consider polyurethane compounds that provide glossy shine and high abrasion resistance. Acrylic paints metals are less suitable, as they are more elastic, but less durable to mechanical impacts on piers or stones.
The color choice requires special attention. Dark colors (black, dark blue) are heated much more than light colors in the sun, which leads to the expansion of the metal and, as a result, microcracks in the paint layer. The best choice is light shades.reflecting ultraviolet light and reducing the thermal load on the structure.
- 🎨 epoxy enamel Maximum strength and adhesion, but a complex application process.
- 🛡️ Aluminum soils A mandatory base layer, often containing zinc or chromates.
- 🌡️ Heat resistance This is an important factor if the boat is kept in the open sun.
- 🌊 Antifouling properties It is useful for boats that stay in the water for a long time.
When buying materials, always check the compatibility of components. If you use soil from one manufacturer and paint from another, there may be a chemical conflict that leads to bloating. paint-system in one place and one stamp.
Surface Preparation: Demolishing and Cleaning
The quality of painting depends on 80% of the surface preparation. Aluminum D16AT, especially on older boats, often has traces of deep corrosion, dents and remnants of old, cracked coating. You need to start with the complete dismantling of all removable equipment: seats, runduks, transom plates and liner racks. The body must be completely "naked".
The best way to remove old paint and oxides is to use mechanical methods. A petal-circle grinder or a brush-short on a drill will effectively remove the loose layer. However, it is important not to overdo it: too aggressive a sweep can leave deep scratches that will become hot spots of tension. The ideal surface should be matte, rough, but without deep furrows.
☑️ Checklist for hull preparation
⚠️ Attention: When stripping aluminum, fine metal dust is produced that is explosive and harmful to the lungs. Work in a respirator and ensure good ventilation. The sparks from the power tool should not get on flammable solvents.
After mechanical cleaning, chemical etching or special rust converters for aluminum should be performed if there are hard-to-reach places left. degreasingUse white spirits, acetone or specialized degreasers, wipe the surface with pure rags, constantly changing it so that you don't smear the fat around the body.
Aluminum alloy primer technology
Printing is a critical step in ensuring the adhesion of the finish layer. For Kazanok, the most common two-component epoxy soils are used, they create a strong chemical bond with the metal and serve as a barrier to moisture, and you need to apply the soil immediately after degreasing, until a new layer of oxides has formed on the aluminum, which can worsen the adhesion.
The application technology requires strict adherence to the proportions of mixing the base and hardener. If you add too much hardener, the soil will become brittle and crack quickly. If not enough, it will not gain the necessary hardness and will dry for a long time. Mix right before work, because the viability of the finished composition is limited (usually 2-4 hours).
| Parameter | Description | Recommended value |
|---|---|---|
| Application temperature | Optimal temperature conditions | +15...+25 °C |
| Air humidity | Permissible humidity in the room | Not more than 80%. |
| Number of layers | Minimum number of coatings | 2 layers |
| Time to dry | Interlayer interval | 12:24 hours. |
You can apply the soil with a brush, roller or spray gun. The spray gun gives the smoothest layer without stripes, but requires dilution of the soil to a certain viscosity. It is convenient to paint corners, seams and hard-to-reach places where moisture can accumulate. It is important to evenly cover the entire body without leaving any gaps.
Do I need to grind the soil?
Interlayer grinding is necessary if the break between layering exceeds the time specified in the instructions (usually 24 hours), this ensures mechanical adhesion of the layers. Use fine sandpaper (P240-P320) to not damage the layer, but only make it matte.
Finishing and drying
Once the soil is completely dry and grinded, the enamel is applied, and the technology is similar to priming, but it requires even more care, because the finish layer is visible to everyone. Enamel is applied in 2-3 thin layers. Trying to close all the irregularities with one thick layer will lead to sweating and long drying inside the coating.
Pay special attention to temperature. Aluminum has a high thermal conductivity. If you paint a boat outside on a hot day, the metal will heat up and the paint solvent will evaporate too quickly. This causes the orange peel effect or bubbling, and it's best to do it in the shade or in a temperature controlled room.
- 🖌️ First layer It can be slightly diluted for better penetrating ability.
- 💧 Second layer - applied the main viscosity, forms gloss and color.
- ⏱️ Cover time. Between the layers, be sure to observe the intervals specified by the manufacturer.
- 🌬️ Ventilation - necessary to remove solvent vapors, but without drafts carrying dust.
Drying should take place in a clean, dry room, dust deposited on the sticky paint will spoil the entire appearance. Full polymerization (the maximum strength set) of epoxy enamel takes from 7 to 14 days, during which time it is not recommended to launch the boat into the water or subjected it to mechanical stress.
Use paint tape and cover film to protect the transom where the motor will be attached and the internal floorboards, which will save time to clean the paint droplets in places where they are not needed.
Removal of defects and typical errors
Even with careful preparation, defects can occur, and one of the most common problems is crater formation.