Sometimes it becomes necessary to protect the waterproofing of mobile concrete structures from corrosion, which are difficult to operate. In this case, traditional polyurethane mastic can be used. Having familiarized yourself with the range of modern building materials, you can pay attention to the products of the Hyperdesmo brand, which are offered in jars of various sizes. It is noteworthy that this composition may have a different color, namely: red, gray, white, green or dark brown. When ordering, please pay attention to this in order to create an aesthetic layer on the surface.
Description
The waterproofing material mentioned above provides excellent corrosion protection for various mobile concrete structures. Application can be carried out on the elements of balconies, swimming pools, reservoirs, terraces, stadiums and roofs. Mastic can be used to create a waterproofing layer, as well as a protective coating against moisture.
Benefit Testimonials
Described polyurethanemastic is very popular among consumers for the reason that it is able to transform into an elastic membrane when a one-component element interacts with air. According to users, it perfectly adheres to all sorts of surfaces, which simplifies the work. The composition is characterized by high resistance to oils, s alts, alkalis, acids, ozone, ultraviolet radiation, microorganisms and gasoline.
Users like that the mastic retains its properties even when conditions change, for example, when the temperature drops below zero. Polyurethane waterproofing mastic is resistant to abrasion and does not emit substances hazardous to human he alth. It is universal, as users emphasize, and it can be used for interior and exterior work.
Surface preparation tips
Before applying a one-component mastic, you should read the advice of specialists in laying the material on the surface. The base must first be prepared. There should be no traces of cement laitance, dust or oils on the coating. It is important to take into account the type of rough coating and, if necessary, use a primer. Polyurethane mastic should only be applied after the surface has been treated with a sealant if the substrate has cracks larger than 1 mm, corner joints or expansion joints. All such errors can be easily corrected independently. Application of the product is unacceptable on weak surfaces,it is necessary to refrain from using if the strength of the concrete to be coated is less than 20 MPa. When carrying out work on the internal waterproofing of underground structures, it is first necessary to make a good waterproofing.
Specifications
Polyurethane mastic has certain technical characteristics, including a dry residue of 95%, as well as a density that varies from 1.3 to 1.4 g/cm3. It is important to take into account that at 20 °C the composition retains a viscosity of 4.5 to 7.5 mPas. The film at +25°C and humidity of 55% is formed after 6 hours, while the application of the second layer should be carried out after the polymerization stage. It takes from 6 hours to a day. As for the period of complete polymerization, it will occur after 7 days. Polyurethane mastic "Hyperdesmo", reviews of which are presented in the article, can be operated at a wide temperature range, which varies from -50 to +90 ° С. On the surface of the composition after hardening, short-term exposure to elevated temperature for 3 minutes is possible. In this case, the increase can reach +250 °C. For specialists and private consumers, such a parameter as the consumption of the product, which is 1.3 kg / m 3, is important2.
Design Features
After careful preparation of the surface, you can start applying the mastic. First of all, you need to mix it. For this it is bestuse a spiral stirrer with a diameter of 140 mm. Polyurethane waterproofing mastic "Hyperdesmo" can be mixed with a construction drill, while it must be set at 200 rpm. Mixing should last approximately 4 minutes. If the application is carried out by hand, then it is best to use a large paint brush for this, it should have short, stiff bristles. Some prefer a knurling roller, but it should have a short nap. Specialists use mechanized application, for this you can use an airless spray device that is designed to work with such substances with high viscosity.
Specialist recommendations
Polyurethane mastic "Hyperdesmo" (25 kg), the consumption of which was mentioned above, should be applied in several layers, there may be two or three. It is necessary to visually monitor the thickness, and if after the end of the procedure the lower layer is still visible, then this zone must be processed additionally. As soon as a film appears on the first layer, you can start applying the next one.
If the work is carried out in the summer, then this will happen in about 8 hours. The coating will become durable in 7 days. It is important to avoid excessive application of mastic. Approximately 0.7 kg should be spent for each layer. If you allow an excess, then this can cause bubbles to appear on the base. It is important to follow the technology when you use polyurethane mastic"Hyperdesmo". Hyperdesmo (25 kg) can be supplemented with reinforced polymer mesh or fiberglass. By applying a package of dry quartz sand, the wear resistance of the coating can be significantly increased.
Conclusion
When the ambient temperature is low, the mastic may thicken, this will make it difficult for the master. In order to exclude such phenomena, before starting work, you should try to maintain the room temperature in the range from +15 to +30 ° C. If necessary, 10% xylene or toluene can be added to the ingredients of the composition. If other solvents are used, then the substance, quite possibly, will simply cease to harden.
After completion of the application stage, the equipment should be cleaned, it is necessary to carry out these works with acetone or xylene. The hardening of the surface will depend on the temperature of the external air, as well as humidity. If the thermometer has dropped quite low, then polymerization will occur slowly.
