Buying an inflatable floating craft is always about finding a balance between price, weight and durability. PVC They often face the problem of vulnerability to sharp rocks, shells and branches, and this is where polyurethane film booking technology comes on the scene, which dramatically changes the boat's performance, transforming a paper boat into a virtually unsinkable and unkillable projectile that can withstand hard contact with underwater obstacles.
However, this process is not without its own specifications, requiring a deep understanding of materials. Polyurethane (TPU) differs significantly from classical PVC in chemical composition and physical properties. Wrong choice of glue Or a temperature disturbance when applied can nullify all efforts by turning the protective layer into flaky skin, and in this article we will examine technical details that are often overlooked in service center advertising booklets.
Is it worth spending more money on upgrading or is it better to buy a boat with a reinforced bottom right away? The answer depends on the intensity of your operation and the type of reservoirs. For fishing in shallow water with a rocky bottom or for hunters dragging a boat through the bushes, this is the answer. The only way to extend the life of a budget model by 3-5 timesSo let's dive into the technical details so you can make an informed decision.
Physical and chemical properties of polyurethane against PVC
To understand the essence of booking, you need to understand the differences in materials. Polyurethane film (TPU) has exceptional elasticity and tensile strength that is significantly superior to standard PVC. At low temperatures, the TPU does not "blown", maintaining flexibility even in severe frost, which is critical for storage and operation in northern latitudes.
Chemical resistance It's almost inert to gasoline, oils and most solvents that can accidentally get on the sides or bottom. Unlike PVC, which can lose plasticizers and become brittle over time, a quality TPU retains its properties for decades, but it's worth remembering that the adhesion of polyurethane to the surface of PVC requires special two-component adhesive systems.
⚠️ Warning: Never try to glue a polyurethane film onto a polychlorinated vinyl with a conventional single-component PVC adhesive. The chemical structure of the materials requires the use of special primers and catalysts, otherwise detachment is guaranteed at the first serious load.
The thickness of the armor also plays a role. Standard thicknesses range from 1,100 to 1,500 Tex. The thicker film gives better protection against punctures, but increases the overall weight of the boat and the stiffness of the cylinders. For most hobbyists, the golden mean is a film about 1,200-1,300 Tex thick, which adds a minimum of weight but maximum of protection.
Application technology: hot and cold methods
The booking process can be divided into two main types: factory hot application and garage cold, and the factory method involves the use of a thermopress, where the film is literally welded under high pressure and temperature into the fabric of the base, which creates a monolithic structure that is extremely difficult to damage or peel off. Hot reservation It is considered a standard of quality and durability.
Manual application (cold) requires careful surface preparation. First, degreasing, then applying a primer, which activates the PVC surface. Then you apply the adhesive, and then you apply the polyurethane film. The quality of the result here is 90% dependent on the skill of the master and the cleanliness of the room. Dust, trapped under the glue, will be the center of future detachment.
The time of polymerization of the adhesive is critical. If you build the boat too early, the adhesion will stay sticky inside. If you hold it too long, the adhesion will not take place. Professionals use timers and strictly monitor the temperature in the room, which should not fall below +18 ° C.
☑️ Quality control of film application
Selection of adhesives and consumables
The basis of the durability of an armored boat is not the film itself, but the glue that holds it. The market is dominated by polyurethane two-part adhesives, which consist of the main component and a hardener (catalyst), the mixing proportions must be met with grammatical accuracy, otherwise the chemical reaction will go wrong. Desmocoll Or specialized trains from boat manufacturers have proven themselves best.
It is important to distinguish between PVC and TPU adhesives. Although chemically they are often similar (polyurethane base), TPU adhesives have a more aggressive formula for adhesive to a smooth surface of polyurethane. Use of universal adhesives is possible, but the lifespan of such a compound will be lower. primer (solvent-activator), which softens the top layer of the material before gluing.
Material consumption depends on the area of the reservation: usually only the bottom of the cylinders (skis) and the full keel are booked; full booking of the entire cylinder is rare due to the high cost and weight gain; when working independently, it is important to have a supply of glue, since its consumption when applied manually is higher than when applied in the factory.
| Parameter | Factory (Hot) | Manual (Cold) | Impact on the boat |
|---|---|---|---|
| Temperature. | 180-220°C | 20-25°C | Heat resistance of the seam |
| Pressure. | High (press) | Hand roller | Adjacent density |
| Time for ready time. | Right away. | 24-72 hours | Speed of operation |
| The risk of detachment | Minimum | Medium/High | Durability |
The secret to the perfect seam
Professionals use Teflon tapes or special press rollers with different hardness of rubber. Soft roller drives air out from under wide surfaces, and hard rolls tightly to the edges and corners where problems most often begin.
Operational specifications of armored boats
What does this upgrade give the owner? psychological comfortYou can safely moor to an unknown shore without fear of sharp stones. The boat becomes less susceptible to ultraviolet light, as the polyurethane layer takes the brunt of solar radiation, protecting the PVC core tissue from degradation. Colored film (khaki, gray, camouflage) also hides fine scuffling.
But there's a downside to the coin, and the boat gets heavier, and depending on the area of the reservation, the extra weight can be anywhere from 5 to 10 kg. For single compact boats, this is a significant increase in portability, and the stiffness of the cylinders increases, which, when pumped, can feel like the rockiness of the seats when the reservation comes on board.
The speed and driving performance vary slightly. Hydrodynamics improves due to a smoother surface of polyurethane, but increasing the weight of a motorized boat and passengers may require a more powerful engine to get on plane. kielson boat After booking, it becomes a great tool for overcoming shallow water, working like a real snowmobile on the water.
⚠️ Attention: Booking doesn't make the boat absolutely invulnerable: Sharp pins of rebar sticking out of the water, or driving full-time through dry sand with rocks can still damage even the thickest TPU.
Repair and restoration of the coating
Even the strongest coating can take attention over time: small cuts and punctures on polyurethane film are easier to repair than on conventional PVC. Due to the high elasticity of the TPU, patches are laid perfectly on it, forming a monolith. The same two-part adhesives and pieces of donor film are used for repair.
The more difficult part is detachment of the edges if the application technology has been compromised, which requires a complete re-painting of the problem area: cleaning the old glue, re-application of the primer and fixation. It is important to prevent moisture from getting under the detached film, as this can lead to rotting of the fabric of the base (polyester cord) if the boat is stored in the assembled form.
Caring for an armored boat is simple: just wash the dirt and salt with fresh water after each exit. Aggressive chemistry is not required for washing. It is better to keep such a boat in a straightened form or in a free twist, avoiding sharp clamps in the cold, although the TPU is less sensitive to this than PVC.
Store a small repair kit (a piece of film, a tube of glue, a brush and a degreaser) right in the boat bag, which will eliminate an accidental cut right on the fishing trip, without waiting for you to return to the garage.
Economic feasibility and final choice
If you own a cloth boat with a density of 750-850 g/m2 and plan to actively operate it on difficult water bodies, then you can use it in a very small way. reservation The cost of a service or material for self-employment pays off by extending the life of the boat several times, and you actually get a hybrid: the lightness of the inflatable side and the strength of an aluminum or composite boat.
If your boat is originally made of dense reinforced PVC (1100 g/m2 and above) with a reinforced bottom, then the point in additional polyurethane reservation is lost. In such cases, it is better to monitor the state of the seams and do the maintenance on time. For budget models, which often break into driftwoods, turning into a “tank” using TPU film is a second chance for a long life.
When making a decision, weigh the pros and cons. Consider your physical capacity to carry a heavier boat, your budget for craftsmen and the geography of your voyages. A well-constructed booking is not just tuning, it's changing the safety class of your boat.
Reservations make the most sense for thin PVC boats used on rocky rivers, and for dense membrane fabrics, it's a waste of weight and money.
Frequently Asked Questions (FAQ)
How much will the weight of the boat increase after booking?
The weight depends on the area of coverage. Booking only the quilson and the bottom of the cylinders ("ski") will add about 3-5 kg. Full booking of all cylinders can increase the weight by 8-12 kg. The exact figure can be obtained by weighing the square meter of the film used and multiplying by the area of the sticker.
Can I put a film in the garage?
Theoretically, you can have sterile cleanliness, temperature (+20...+25°C) and quality two-component materials. But without experience, there is a high risk of bubbles and waves that will spoil the appearance and functionality.
Does the booking affect the manufacturer’s warranty?
In most cases, any interference with the design, including the application of third-party materials by adhesive method, removes the factory warranty. If the boat is new, it is worth consulting with the dealer or waiting for the warranty period to expire before upgrading.
What color of film should I choose?
In terms of practicality, gray ("wet asphalt") is optimal: it has the least noticeable dirt, it doesn't heat up as much in the sun as black, and it doesn't fade as prominently as bright colors. Camouflage is good for hunting, but harder to pick up when repairing.