Coverage according to GOST 9.032-74:
- of inner untreated surfaces, enamel НЦ-51233 red-brown (pigment suspension in a solution of colloxylin and alkyd resin in a mixture of organic solvents with addition of plasticizers)
- of exterior surfaces, enamel PF-115 (ПФ-115, based on pentaphthalic varnish) blue, according to GOST 6465-76.VI.U1 (У1), except for surfaces coated according to the technical requirements of unit's assembly components drawings.