Installing a fixed anchor bolt is not just a matter of convenience, but often a necessity for safe fishing or recreation on the water. Many owners of inflatable vessels face a situation where the standard rings are not enough or their location does not allow them to comfortably operate the boat when anchoring. Self-design allows you to place the anchor points exactly where you need them, significantly improving the functionality of the vessel. PVC.
This process requires care, but it is quite possible at home with the availability of quality materials. Mistakes in the stage of surface preparation or selection of chemistry can lead to the removal of the element at the most inappropriate moment, so each step should be approached with the utmost responsibility. anchor It's been going on for decades.
The challenge is that the polyvinyl chloride that the cylinders are made of is inert and slippery. It's not enough to just put a piece on glue; you have to create a chemical reaction between the layers, turning the compound into a monolith, which is why understanding the physicochemical processes that occur when glued is more important than the force of the press.
Selection of materials and tools for reliable fixation
The first and most critical step is to find the right glue. Not all adhesives work equally well with PVC, especially in water environments with temperature variations. Boats are most commonly used with two-component polyurethane compounds or special polychloroprene-based adhesives. Two-component adhesives, such as: Desmocoll or its analogues, provide the best strength, as they create an irreversible chemical bond.
However, if you plan to operate the boat in a gentle mode, you can do with a high-quality single-component polyurethane glue, although the time of its full polymerization will be much longer, it is important that the composition does not contain solvents that aggressively affect the plastic, which can lead to the destruction of the structure of the tissue of the cylinder over time. adhesive It must remain elastic after drying, following the deformations of the cylinder.
Buy glue and patch fabric from one manufacturer or make sure they are chemically compatible to avoid stratification of the seam.
In addition to glue, you'll need a special PVC primer, which degreases the surface and, more importantly, slightly dissolves the top layer of the polymer, opening the pores for deep penetration of the glue. Without using a primer, the strength of the compound is reduced by many times, turning into a normal surface adhesion. Also prepare acetone or a special degreaser for final cleaning.
As for the bolt itself, the choice is between plastic and metal. Plastic parts are easier to glue, because the temperature expansion coefficient is close to the balloon, but they are less durable at high loads. pyre It is more reliable, but requires a perfectly flat area and often has sharp edges that can damage the fabric if installed incorrectly.
Surface preparation: a key stage of work
The success of the whole operation depends on 80% of how well you prepare the gluing site. Dirt, dust, factory lubrication or just finger fat are the main enemies of adhesion. Start with the choice of a place: it should be smooth, without folds and seams, preferably on hard areas of the cylinder or on a hump bar, if the design allows.
The first thing you need to do is clean the surface, use fine-grained sandpaper (240-400 grains) or a special abrasive scotch bright, and your goal is not to peel off the PVC layer, but to create micro-scratch marks that increase the contact area, and the movements should be circular, covering an area slightly larger than the size of the base of the roach.
⚠️ Warning: Don't overdo the cleaning! If you damage the reinforcement cord or make a dent in the fabric, it will become a stress point where the balloon can burst under pressure.
After machining, chemical cleaning is followed. Wash the cleaned area and the back of the fry bolt thoroughly with a rag soaked in acetone or a special degreaser. Change the cloth as it gets dirty so you don't smear the dirt on the surface. Let the solvent evaporate completely - it takes a couple of minutes.
Then you put the primer on, and you put it in a thin layer on the balloon and on the part that you're sticking on, and you wait until you put the primer in, and you wait for a certain amount of time -- usually 10 to 20 minutes, read the instructions for a particular brand -- until it's matte and sticky to the touch, but it doesn't get your finger dirty, and you can't skip that step if you want to get it. monolithic.
Technology of applying glue and gluing
The process of applying the glue requires patience and precision. If you use a two-part compound, mix the base with the hardener in a strict proportion specified by the manufacturer. Violation of the proportions will either not freeze or become too brittle. Mix the components carefully to uniformity for 2-3 minutes.
Apply a brush or spatula with a thin layer on both glued surfaces. The first layer is often absorbed into the pores, so after applying it (and lightly drying for 10-15 minutes), it is recommended to apply the second layer. It is the second layer that creates the main adhesive mass. It is important to prevent dust from entering between the layers.
The secret of "cold" and "hot" gluing
In cold gluing, the parts are joined after drying the glue completely (it stops sticking); in hot glue, they are joined while the glue is still sticky; for PVC boats and heavy crums, a hot or reheating hairdryer method is more often recommended to activate the glue before the final pressing.
When the glue on both surfaces is no longer liquid but sticky (time depends on air temperature and glue type), combine the parts. Apply the rim bolt exactly on the markup. From now on, you can't fix the situation without breaking the integrity of the glue seam. Press the part hard, driving the air from the center to the edges.
Use a roller to ensure uniform pressure. Roll the glued element with force, paying special attention to the edges. If the glue is protruding around the perimeter, this is a good sign that contact has occurred throughout the area. Remove the excess immediately until it has frozen using a rag with solvent.
Pressure and time of polymerization
Simply pressing a part with your hand is not enough to get maximum strength. Polymer materials require long-term pressure to form strong intermolecular bonds. The ideal option is to use a load weighing 5-10 kg, evenly distributed over the area of the shell bolt, the cargo can be left for a day or more.
The time of complete polymerization of the adhesive is not the same as the time of initial grasping. Although the boat can be used in 24 hours, the final strength of the seam will gain in 3-5 days, and in some cases up to a week, during which it is not recommended to load the crust, test it for tearing or expose the boat to extreme conditions.
☑️ Gluing checklist
Temperature is also important: the optimum temperature for gluing is from +15 to +25 degrees Celsius; at lower temperatures, the polymerization process slows down, and the glue may not gain the stated strength; at high temperatures, the glue dries too quickly, before it can penetrate the material structure.
If you're working in the cold season, it's recommended that you use a building dryer to carefully warm up the adhesive surfaces before you join, which activates the adhesive layer and improves adhesion, but beware: overheating PVC will cause it to deform and melt.
Table of specifications of adhesive compositions
For the convenience of material selection, we suggest comparing the main types of adhesives used to work with PVC. Each of them has its own advantages and limitations, which must be considered before starting work.
| Type of glue | Basis | Seizure time | Strength | Features |
|---|---|---|---|---|
| Polyurethane (2 comp.) | Polyurethane + hardener | 24-48 hours | Maximum | Requires precise dosage, squashing |
| Polychloroprene | neoprene | 12:24 hours. | High. | Elastic, often requires heating |
| Polyurethane (1-but comp.) | Polyurethane | 24-72 hours | Medium/High | Easy to use, long drying time |
| Universal "liquid nails" | Other. | 12:24 hours. | Low. | Not recommended for water loads |
To install an anchor ditch that will experience constant jerking loads, use only two-component polyurethane adhesives.
Common mistakes and precautions
One of the most common mistakes is saving on primer, and many craftsmen try to do just sweeping and degreasing, believing that "it will go away." On dry surfaces, this may work, but under constant humidity and dynamic stress, this seam will quickly collapse. Primer creates a chemical bridge between inert PVC and glue.
Another mistake is choosing the wrong place to set up, not to put it on the curves of the balloon or in places where the fabric is heavily stretched and changes its geometry, permanent deformation will lead to detachment of the edges, also avoid installation near valves or seams where the thickness of the material changes.
⚠️ Warning: Never put bolts on the boat in areas of contact with oars or transoms where there is a high risk of mechanical damage by foreign objects.
Ignoring drying time is the third killer of good gluing, and if you start loading the pores early, you disrupt the process of polymer chain formation, leaving the adhesive semi-liquid or loose. Patience. In this case, it is the master’s main tool.
Also worth mentioning is safety when working with chemicals: solvents and adhesives are toxic and flammable; work should be done in a well-ventilated room, away from open flames; use rubber gloves to avoid getting chemical burns to the skin of the hands, which are difficult to heal.
FAQ: Frequently asked questions
Can I put a slap on an already loaded boat?
Theoretically, it's possible, but it's not recommended, because on a high-pumped boat, the fabric is stretched, and when you put the load on, the balloon will deform, which will disrupt the geometry of the gluing, and it's better to do it on a deflated but straightened boat, or just to slightly pump it up just to straighten the folds at the glue site, but without too much tension.
How many days after the sticking can I put the boat on the water?
The minimum waiting time is 24 hours at temperatures above +20°C. However, for a set of full strength and safety guarantee, it is recommended to wait at least 3 days (72 hours), full polymerization takes up to 7 days, during which it is better to avoid extreme loads on the new element.
What do I do if I get a slap off?
You have to completely remove the old glue from the balloon and the parts, and this is done mechanically (by carefully cutting) and chemically (by solvent), and then the surface is cleaned again, degreased, and the gluing procedure is repeated again, gluing over the old layer is not allowed, there will be no adhesion.
What is the maximum weight of the anchor will withstand glued rum?
A well-adhered standard rum on a 5th or 7th cylinder can withstand a pull of 100 to 300 kg or more, depending on the base area. However, it is important to consider not the static weight of the anchor, but the dynamic load during the jerk. For heavy anchors (> 10 kg), it is recommended to use a dual mounting system or a transom rum.
Do I need to clean the bolt itself if it is plastic?
Plastic parts often have a smooth, factory surface, sometimes with a separating lubricant from the mold, which must be skinned to a matte and defatted, otherwise the glue will only hold due to the roughness of the balloon, which will dramatically reduce the strength of the joint.