Sometimes there is a need for corrosion protection of waterproofing of mobile concrete structures, which are difficult to operate. In this case, traditional polyurethane mastic can be used. Having familiarized yourself with the assortment of modern building materials, you can pay attention to the Hyperdesmo brand products, which are offered in banks of various sizes. It is noteworthy that this composition can have a different color, namely: red, gray, white, green or dark brown. When ordering, you should pay attention to create an aesthetic layer on the surface.
Description
The waterproofing material mentioned above provides excellent corrosion protection to various moving concrete structures. Application can be made to the elements of balconies, pools, tanks, terraces, stadiums and roofs. Mastic can be used to create a waterproofing layer, as well as a protective coating against moisture.
Benefit Reviews
The described polyurethane mastic is very popular among consumers for the reason that it is able to transform into an elastic membrane during the interaction of a single-component element with air. According to users, it adheres perfectly to all kinds of surfaces, which simplifies the work. The composition is characterized by high resistance to oils, salts, alkalis, acids, ozone, ultraviolet radiation, microorganisms and gasoline.
Users like that the mastic retains its properties even when the 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 health. It is universal, as users emphasize, and it can be used for internal and external work.
Surface Preparation Tips
Before using one-component mastic, you should familiarize yourself with the advice of specialists on laying material on the surface. The base must first be prepared. No traces of cement milk, dust or oils should remain on the coating. It is important to consider the type of rough coating and, if necessary, use a primer. Polyurethane mastic should be applied only after surface treatment with sealant, if there are cracks on the base more 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 use 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 initially necessary to make good waterproofing.
Specifications
Polyurethane mastic has certain technical characteristics, among which there is a dry residue of 95%, as well as a density that varies from 1.3 to 1.4 g / cm 3 . It is important to note that at 20 ° C the composition retains a viscosity of 4.5 to 7.5 MPa * s. A film at a temperature of +25 ° C and a humidity of 55% is formed after 6 hours, while the application of the second layer should be carried out after the polymerization step. It takes from 6 hours to a day. As for the period of complete polymerization, it will occur in 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 ° . After solidification, a short-term exposure to elevated temperature for 3 minutes is possible on the surface of the composition. Moreover, the increase can reach +250 ° . For specialists and private consumers, such a parameter as the consumption of the product, which is 1.3 kg / m 2 , is important.
Application Features
After thorough preparation of the surface, you can start applying the mastic. The first step is to mix it. To do this, it is best to use a spiral mixer, the diameter of which is 140 mm. The Hyperdesmo polyurethane waterproofing mastic can be mixed with a construction drill, and it must be installed at 200 rpm. Stirring should last about 4 minutes. If the application is carried out manually, it is best to use a large paint brush, it should have a short stiff bristle. Some people prefer a knurling roller, but it should have a short pile. Specialists use mechanized application, for this you can use an airless spray device that is designed to work with similar substances with high viscosity.
Specialist recommendations
The Hyperdesmo polyurethane mastic (25 kg), the consumption of which was mentioned above, should be applied in several layers, there can 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 additionally processed. As soon as the film appears on the first layer, you can begin to apply the next.
If the work is carried out in the summer, then this will happen in about 8 hours. Durable coating will be in 7 days. It is important to eliminate excessive application of mastic. For each layer, approximately 0.7 kg should be spent. If an excess is allowed, then this can cause bubbles to appear on the base. It is important to observe the technology when you use Hyperdesmo polyurethane mastic. Hyperdesmo (25 kg) can be supplemented with a reinforced polymer mesh or fiberglass. Using a package of dry quartz sand, you can significantly increase the wear resistance of the coating.
Conclusion
At low ambient temperatures, the mastic may thicken, this will complicate the work of 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 ° . 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 completing the application phase, the equipment should be cleaned; it is necessary to carry out these works using acetone or xylene. The solidification of the surface will depend on the temperature of the external air, as well as humidity. If the thermometer has dropped quite low, the polymerization will occur slowly.