liquid composition based on organic solvents to facilitate the adherence of coatings to substrates . a composition having the following ingredients provides excellent adherence characteristics to coatings applied to various substrates pretreated with the composition . the composition contains a mixture of organic solvents as follows : from 17 to 35 % of xylenes , from 4 to 14 % of ethylbenzene , from 55 to 75 % of white spirit , and optionally from 0 . 05 to 3 % of an methylpolysiloxane modified by a polyether oil . the composition may be used on substrates like steel , iron , copper , brass , chrome , tin , aluminum , glass , earthenware , rubber , plastic and polyesters . it leads to improved adherence to such substrates of coatings like paint , varnish , glue and mastic as well as coatings applied by chrome - plating , galvanization and gold and silver plating .