... of the main uses of shellac in different fields are: Surface coating - As under coat, primer, sealer, French Polish, ... Leather dressing, Fruit Coating etc. Printing - Flexographic ink, Waterproof ink, Photo engraving. ... Paper - Paper varnish, playing cards. Rubber - Stiffening agent, surface finish. Adhesive - Gasket cement, sealing wax, pyrotechnic Optical Cement. ...