GF-021 primer has been known for over 30 years. During this period, the so-called painting soil has undergone a number of changes, but has not lost its relevance. The composition is a composition created on the basis of alkyd varnish, which is called glyptal. This type of primer is used as a preparation for paint work where metal substrates are involved. Enamels and compositions made on an alkyd basis can subsequently be applied to the latter.
Specifications
GF-021 is a primer that is flexible, has a short drying time, and is also resistant to external influences. All these features allow the use of soil for the preparation of various products. If we consider the positive aspects, then we cannot but highlight the ability of the mixture to protect metals from corrosion processes. That is why the paint primer is used as an independent product, which does not require additional processing.
GOST 25129-82
GF-021 is a primer, which, according to standards, should have a reddish-brown tint, but not so long ago gray and white varieties appeared on sale. Their production by the mentioned document is not regulated, therefore, the technical conditions are observed during the manufacturing process , but the recipe can be selected by the manufacturer independently. If after application the surface is heated to 100 degrees, then drying takes place within 35 minutes. Under normal conditions, which are characterized by a temperature range from 20 to 25 degrees, this time increases to 24 hours. After drying, the base becomes semi-gloss or dull. The product can be repainted with soil to improve its protective properties. Before applying enamel, it is recommended to sand the resulting layer.
Additional Standards Information
GF-021 is a primer having a bending plasticity that does not exceed 1 millimeter. Strength indicators are 50 cm. Experts quite often pay attention to hardness, which in conventional units is 0, 35. Do not use a composition that is stored after manufacture for more than 6 months. However, a number of manufacturers indicate an impressive figure, which varies within 2 years.
Features of use
Primer GF-021 can be used at any temperature conditions. But the application should be carried out exclusively at positive temperatures, this requirement is due to the fact that the composition must reach the required consistency in a timely manner. After drying, the surface easily copes with the effects of high humidity, low temperatures, and is also resistant to minor mechanical damage. The primer GF-021 is also characterized by negative sides, the main of which is the lack of ability to carry fire. The mixture belongs to flammable substances. Therefore, when applying, fire rules must be observed. This requirement also applies to the storage phase. After drying, the paint is not so exposed to the flame, however, in the first hours after application, it retains the ability to ignite and emits an odor. The latter property is explained by the presence of volatile compounds, which during evaporation contribute to the drying of the soil.
Recommendations for use
Primer GF-021, the characteristics of which are presented in the article, should be applied to a previously prepared surface. Depending on whether the base was painted before work or not, cleaning, degreasing and grinding will be required. As for cleaning and grinding, they should be done using appropriate tools, while the remaining operation is performed using white spirit. It is important to check how dry the surface is before applying the composition. If the substrate is characterized by high humidity and low temperatures, the primer GF-021, GOST of which was mentioned above, will not set well. Among other things, these conditions contribute to the loss of the composition of protective properties.
Specialist recommendation
If a solid film has formed on the surface during long-term storage, it must be disposed of before use.
Primer consumption
Primer GF-021, the flow rate of which you should know before purchasing the product, can be applied with a layer of different thicknesses. Per square meter, you may need from 60 to 100 grams of the composition. The wide spread is also explained by different methods of applying the mixture. As for the layer thickness, this parameter can vary between 15 and 20 microns. Before deciding on how much paint primer will be needed for work, it should be decided which application technology will be used. This can be lubrication, dipping and spraying. The latter technique can be carried out by airless or airborne methods. As for lubrication, it can be done with a roller or brush. Using a specific tool will affect the flow.
Tricks to use
In order to achieve a reduction in primer consumption, dilute it before application with white spirit. In particular, this approach is relevant when spraying onto a metal surface. To carry out these manipulations, xylene or solvent can be used. If you decide to use the last two substances, it is important to adhere to a ratio of 1: 1. While the total volume of soluble substances should not be more than 1/4 of the original composition. This is true for primers of all manufacturers.
Conclusion
GF-021 is today considered one of the most popular paints and varnishes. The popularity of this product is due to its versatility, since it is possible to use the composition for carrying out both internal and external works. Another important factor is that the cost of goods is reasonably affordable, which indicates the possibility of using the mixture by private craftsmen.