Some of the finishing components have a shelf life listed in  the material or technical data sheet supplied by the coating  manufacturer. Those materials should be marked on the  container, with a date of purchase, in the event that they are  not used immediately.  The process of painting, stripping, or refinishing an  aircraft requires the use of various coatings, chemicals, and  procedures that may be hazardous if proper precautions are  not utilized to protect personnel involved in their use. The most significant hazards are airborne chemicals inhaled  either from the vapors of opened paint containers or atomized  mist resulting from spraying applications. There are two  types of devices available to protect against airborne hazards:  respirators and forced-air breathing systems.  A respirator is a device worn over the nose and mouth to  filter particles and organic vapors from the air being inhaled.  The most common type incorporate double charcoal-filtered  cartridges with replaceable dust filters that fits to the face over  the nose and mouth with a tight seal. When properly used, this  type of respirator provides protection against the inhalation of  organic vapors, dust, mists of paints, lacquers, and enamels.  A respirator does not provide protection against paints and  coatings containing isocyanates (polyurethane paint).  A respirator must be used in an area of adequate ventilation.  If breathing becomes difficult, there is a smell or taste the  contaminant(s), or an individual becomes dizzy or feel  nauseous, they should leave the area and seek fresh air  and assistance as necessary. Carefully read the warnings  furnished with each respirator describing the limits and  materials for which they provide protection. A forced-air breathing system must be used when spraying  any type of polyurethane or any coating that contains  isocyanates. It is also recommended for all spraying and  stripping of any type, whether chemical or media blasting.  The system provides a constant source of fresh air for  breathing, which is pumped into the mask through a hose  from an electric turbine pump.  When solvents are used for cleaning paint equipment and  spray guns, the area must be free of any open flame or other  heat source. Solvent should not be randomly sprayed into  the atmosphere when cleaning the guns. Solvents should not  be used to wash or clean paint and other coatings from bare  hands and arms. Use protective gloves and clothing during  all spraying operations. In most states, there are Occupational Safety Hazard  Administration (OSHA) regulations in effect that may require  personnel to be protected from vapors and other hazards while  on the job. In any hangar or shop, personnel must be vigilant  and provide and use protection for safety. Protective Equipment for Personnel Protective clothing, such as Tyvek$^{®}$ coveralls, should be  worn that not only protects personnel from the paint but also  help keep dust off the painted surfaces. Rubber gloves must  be worn when any stripper, etching solution, conversion  coatings, and solvent is used.  8-22