Special means are used to protect the surface of materials. One of them is BT-577 varnish (or Kuzbasslak). This product is used to protect metal, wood and concrete surfaces both outdoors and indoors.
Description
Kuzbasslak began to be produced even before the outbreak of World War I. Over time, its composition has changed slightly. Previously, P-4 was used as a solvent. Because of this, the varnish layer dried out for a very long time (from 24 to 32 hours). Currently, the composition includes synthetic additives that accelerate the drying process and give the treated surface an extra shine.
BT-577 varnish is a black liquid of uniform composition and viscous in consistency without extraneous impurities. It is a coal tar pitch dissolved in organic solvents (benzene, naphtha). Drying oils are not included. It is allowed to use the product together with chemically resistant perchlorovinyl varnish in a ratio of 1: 1.
To improve the quality and increase the life of the surfaces, iron minium (up to 30-34%) or aluminum powder (up to 15-20%) is added to it.
Kuzbasslak, the average price of which is 50 rubles per 1 liter, is a solution of polymer resins, bitumen in organic solvents. Also, special additives are introduced into the composition, which improve the physical and chemical properties, operational characteristics.
Product Specifications
Kuzbasslak (we will discuss its application below) has the following protective and waterproofing properties:
- varnish has good adhesion to surfaces of various types;
- the layer of the product is glossy, durable, the pores are practically absent;
- resistant to mechanical stress and significant loads. After removing the load, the coating is restored to its performance;
- withstands temperature extremes and severe frosts, does not crack from the cold;
- even in adverse weather conditions, the varnish layer retains its structure and coating quality;
- does not allow microorganisms to appear.
The surface of the materials treated with varnish is not afraid of frost, moisture (even sea water), exposure to the sun (ultraviolet radiation), and corrosion. After complete drying, it can be cleaned using detergents.
It is allowed to increase the viscosity of Kuzbasslak during storage. Moreover, before use, it is diluted with a solvent in an amount up to 10%. This will not entail a deterioration in the performance and characteristics of the product.
Advantages and disadvantages
The main advantages of BT-577 varnish are the following:
- High degree of corrosion protection.
Profitability is another significant plus in favor of the Kuzbasslak product. Using it in several layers does not entail large expenses, since only 100-200 ml of the drug will be spent per square meter.
Of the shortcomings, only one can be distinguished - black, which is difficult if necessary to cover with another means.
BT-577 varnish is not applied to the material in production. It is used at the end of installation work.
Kuzbasslak: application
It is used mainly to protect metal, concrete (reinforced concrete), brick surfaces from the influence of atmospheric factors. As a waterproofing, the Kuzbasslak tool can also be used. The use of wood is another area of use of this composition. This is to prevent wood rot.
To protect cars (for the most part of the bottom) from the appearance of corrosion, Kuzbasslak is also used. The use of the product is justified in cases with other equipment: to protect trailers, carts, towbars and so on.
BT-577 is used for gluing rolled or sheet materials when laying the roof. You do not need to use open fire for this, thereby reducing the likelihood of fire.
When using "Kuzbasslak" until the time of application of paint (other paintwork) it will replace the primer layer.
Application
The product is applied in various ways: with a brush, rags, roller, spray using a spray. Individual parts of small dimensions can simply be dipped into a varnish solution.
The surface to be treated must be clean, free from dirt, dust and rust.
Kuzbasslak is applied in several layers (usually two or three layers are sufficient). Drying time depends on temperature and can vary from several hours to a day. As a drying accelerator, you can use a desiccant, which is added to the solution.
Use the product is allowed in the temperature range plus 10-20 degrees. For storage, the temperature should be in the range from minus forty to plus forty degrees.
BT-577 varnish is a toxic substance. Therefore, all work must be carried out using personal protective equipment and other safety requirements.