Solvents  or  Thinners  are used in Paints  and  lacquers to reduce   the  viscosity  or  consistency  of  the  material   and facilitate  the application of a uniform coating.  They  must  be compatible with the oil or resin present.  After application  the solvent  is  no longer required and should  evaporate  completely from the film.

Another  class of organic liquids used in paint industry  is plasticizers their function is to remain permanently in the  film of  paint  or  varnish  after  application  in  order  to  impart elasticity  and proper adhesion to it.  In contradiction  to  the volatile solvents, plasticizers should be perfectly non-volatile, and should also be chemically stable, and not after in properties on prolonged exposure.

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