1. A method of applying a protective lining, in particular, sealed screens combustion power boiler, characterized in that the surface is sealed waterwalls, which are supposed to cause the protective lining is subjected to purification, followed by two pressurized flue screen bonded together in a pair is maintained at a temperature of from 300 to 800 ° C, preferably at a temperature of about 700 ° C, then mounted on the positioner, the preheating is carried out to a temperature ranging from 80 to 600 ° C, preferably in the range from 300 to 45 0 ° C, whereupon application of protective cladding thickness of from 0.1 to 3.0 mm, preferably about 0.6 mm so that the bonded pair waterwalls sealed with a protective lining deposited finally maintained at a temperature of from 300 to 800 ° C, preferably at a temperature of about 700 ° C, for a time of from 10 to 600 minutes, preferably from 15 to 30 minutes, after which the flue sealed screens with a protective lining deposited razedinyayut.2. A method of applying a protective lining according to Claim. 1, characterized in that the leakproof flue screens bonded to each other by welding with metal sections at their edges and / or flantsam.3. A method of applying a protective lining according to Claim. 1, characterized in that the surface is sealed waterwalls purified by laser ablation using a laser beam having a power output of 100 kW to 600 kW, preferably 300 kW, the spot diameter from 0.1 mm to 1, 0 mm, preferably about 0.5 mm, and scan width of 30 to 80 mm, preferably about 60 mm, the laser pulsation frequency of 10000 Hz to 50000, preferably about 20000 Gts.4. A method of applying a protective lining according to Claim. 1, characterized in that the preliminary temperature
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