Repair or manufacture of inflatable watercraft requires the use of specialized materials capable of withstanding the aggressive effects of water, ultraviolet light and mechanical loads. Clay Clayberg It has proven to be a reliable two-component compound that ensures seam tightness even in extreme conditions of use, and the correct application of this polyurethane adhesive guarantees a longevity of the compound comparable to the factory quality of the assembly.
Many owners PVC They make the fatal mistake of thinking that it's enough to just smear surfaces and press them together. The chemical polymerization reaction requires strict adherence to the proportions of mixing components and temperature regimes. Ignoring the technological nuances leads to the detachment of patches or leaks at the most inopportune moment, which can cost not only property but also life on water.
In this article, we will discuss in detail the entire process of working with this material, from the preparation of tools to the final test of the seam for leakage. hardener You can't add "by eye" how to properly activate the surface of the material and what common mistakes negate all efforts. A deep understanding of the physical and chemical processes will help you perform repairs with quality and forget about the problems with the tightness of the case forever.
specifications and benefits of polyurethane glue Kleiberg
The basis of the composition is polyurethane, which, after reaction with a hardener, forms an elastic but extremely strong structure. Kleiberg It is not afraid of constant contact with water and retains its properties in a wide range of temperatures, making it an ideal choice for repairs. flyboatThese are often used in the cold season or are heated in the sun.
A key feature of the product is its high adhesion to polyvinyl chloride (PVC) and reinforced tissues. Once solidified, the seam becomes invisible and indistinguishable from the main material in its elasticity. Two-component system This allows the master to control the life of the mixture, although for beginners it can be an additional stress factor that requires attention.
Why polyurethane?
Polyurethane adhesives, unlike cyanacrylate adhesives, do not form a rigid, brittle structure. When you bending a boat, the seams stretch with the cloth without cracking, and they are also resistant to hydrolysis, which is moisture-induced destruction, which is critical for products that are permanently in water.
It's important to note that the finished compound is resistant to oils, gasoline and most solvents, which means that accidentally getting fuel on board while refueling the engine won't dissolve the adhesive seam, but it's worth remembering that until full polymerization, the compound is sensitive to moisture, so it's best to do it in a dry room.
Necessary tools and workplace preparation
The quality of the gluing depends on how well you're prepared for the process. You don't need complex industrial equipment, but the toolkit should be complete. The absence of even one element, such as a dryer, can lead to a defect in the connection.
To work with Clayberg. You're gonna need:
- 🧪 Precise scales or syringes for dosing components (base and hardener).
- 🖌️ Brushes with hard bristles or spatulas for applying the composition.
- 🌬️ Hair dryer (construction or household) for surface activation and drying.
- 🧼 Degreasing agent (acetone, ethyl acetate or special PVC cleaner).
- 📏 Line and marker for marking the gluing zone.
The workplace should be well ventilated, as the vapors of solvents and glue components can be toxic. The optimal temperature in the room should be from +18 to +25 degrees Celsius. At lower temperatures, the polymerization reaction slows down, and at too high - the mixture can boil or freeze faster than you can apply it to the material.
Use a glass or metal container to mix the glue. Plastic cups can react with aggressive solvent components, which will spoil the mixture.
Technology of preparation of glue mixture
The most important step is to prepare the working mixture, and the error in proportion is unacceptable: excess hardener will make the seam brittle, and lack of it will prevent the reaction from going to the end, leaving the glue sticky forever. Kleiberg It is usually 100 parts base for 10-15 parts hardener, but always check the instructions on the specific package.
The mixing process should be done in stages. First, mix the base thoroughly in the main container, since polyurethane resins tend to delaminate during storage. Then measure the required amount of base and add a strictly measured volume of hardener.
Example of calculation:Basis: 100g
Hardener: 12g
Total mixture: 112g
After adding the hardener, the mixture must be stirred intensively for 2-3 minutes, scraping the composition from the walls and bottom of the container. This will ensure uniform mass. The viability of the finished mixture is about 40-60 minutes at +20 ° C, so do not cook too much glue at once unless you have experience of fast work.
Step-by-step instructions for gluing the PVC boat
Now, to the process of material bonding, sequencing is critical to getting a strong seam, and each step has a physical basis, and skipping any one of them reduces the reliability of the repair.
The algorithm of actions is as follows:
- 🧹 Cleaning and degreasing: The gluing areas should be cleaned with abrasive (usually green Scotch Brights or sandpaper) before matteness appears, and the surface is then thoroughly wiped with a degreaser.
- 🖌️ Primary application: A thin layer of glue is applied to both glued surfaces, which is necessary to penetrate the adhesive into the pores of the material.
- 🌬️ Drying and activation: The surfaces are dried to a stick (the glue should not stick to the finger). To accelerate and improve the quality, you can heat the layer with a hair dryer to a temperature of 50-60 degrees.
- 🖌️ Secondary application: A second layer of glue is applied, which is also dried to a stick.
- 🔥 Final activation: Both surfaces are warmed up again by a hair dryer until there is a shine and a slight smell, which signals readiness for the connection.
- 🤝 Connection: The parts are combined and strongly pressed against each other, expelling air from under the seam.
☑️ Checklist before gluing
When you connect parts, it's important to keep dust or villi from getting between the layers, and you need to press the parts with force, using a roller or a hard rubber roller, moving from the center to the edges, which will ensure maximum contact area and strength of the joint.
Table of drying and polymerization parameters
Time to dry glue Kleiberg It depends on the temperature of the environment and the thickness of the layer applied, and here are some indicative data that will help you plan your work.
| Air temperature | Time to dry the layer (to the lip) | Time to final activation | Time of complete polymerization |
|---|---|---|---|
| +15°C | 15-20 minutes | 30-40 minutes. | 48-72 hours |
| +20°C | 10-15 minutes | 20-30 minutes | 24-48 hours |
| +25°C | 5-10 minutes | 15-20 minutes | 24 hours. |
| +30°C | 3-5 minutes | 10-15 minutes | 12:24 hours. |
Note that "time to peel" means a state where the glue is no longer liquid but still sticky, and that's when the bonding happens, and full polymerization, when the seam is at its maximum strength and chemical resistance, takes much longer.
Take your time to operate the boat immediately after gluing, let the glue gain at least 80% strength in a warm room before the first descent into the water.
Typical errors and methods of their elimination
Even experienced craftsmen sometimes have problems with gluing, understanding the causes of defects allows you to correct the situation in time or prevent its occurrence, most often problems are associated with a violation of surface preparation technology or temperature regime.
⚠️ Attention: If the glue is sticky after drying and does not dry, then the proportion of the hardener (there is too little of it) has been disturbed or the components have been poorly mixed, and this can only be corrected by completely removing the glue and repeating the procedure.
Another common mistake is gluing cold surfaces together. If you work in a garage in winter, the boat material can be cold even if the air is warmed up. Cold PVC will not give heat to the adhesive layer, and activation will not occur properly.
And we also have this problem of suture bubbles, which is when there's air between the layers, or if the solvent doesn't evaporate, and to avoid that, you have to carefully manage the drying time of each layer and roll the seam with a roller.
⚠️ Attention: Never try to speed up the drying of the glue by directing the jet of hot air dryer too close or for too long. Overheating can cause the solvent to boil inside the layer, which will create pores and weaken the seam.
If the seam is stiff and brittle, it's a sign of a hardener overdose, and it can crack when the boat is first bent, and then you have to cut the defective area and put a new, larger patch.
Tool care and material storage
Once the work is done, it is essential to clean the tool correctly. The frozen polyurethane adhesive is almost impossible to remove mechanically, so you should wash the brushes and spatula immediately while the composition is liquid.
Store components Kleiberg It's a tightly sealed container, a light-proof base, sensitive to moisture from the air, so don't leave the jar open longer than you need, and if properly stored, the material has an shelf life of about 12 months from the date of manufacture.
What to do if the glue in the jar thickens?
If the base has become jelly or has a heterogeneous structure with lumps, you can't use it, it's lost its properties, and trying to reanimate it with a solvent will only worsen the specifications of the future seam.
The hardener also requires tightness, as it can become oxidized and lose activity when in contact with air. Always wipe the bottle's neck before closing so that the lid does not stick to the inside.
Can I put a Kleiberg boat in cold or wet weather?
It is strongly discouraged: low temperature slows down the polymerization reaction, making the seam weak, and high humidity causes glue clouding and bubble formation, which violates the tightness. The ideal conditions are a dry room with a temperature above +18 ° C.
How is Clayberg different from ordinary superglue?
Superglues (cyanacrylates) create a rigid, glassy compound that breaks when the PVC elastic material is flexed. Kleiberg remains elastic after drying, stretching along with the boat, and has high water resistance.
How long does the boat dry after repair before the first descent?
Although surface drying takes several hours, it is recommended to withstand the glued product for a minimum of 24 hours at room temperature, and ideally up to 48 hours, to gain full strength and chemical resistance.
Should I lay PVC before applying Kleiberg?
A special primer layer (primer) significantly improves adhesion, especially for old or contaminated surfaces. If you use a quality cleaner-activator, a separate primer may not be necessary, but for responsible seams, its use is desirable.
How to remove excess glue from the boat?
The fresh glue is removed with a rag soaked in a solvent, and the hardened glue can be gently cut off with a blade to avoid damaging the material, or softened with a special remover of polyurethane sealants.