a.Alkyd resin type: For formulating stoving fillers short-oil to medium-oil alkyd resin types are combined with amino-formaldehyde resins. Nowadays however, oil-free polyesters are increasingly being used. b. Cross-linking proportions: 70:30 is frequently used as the classical cross-linking proportion of alkyd resin to amino resin. However the proportions between 55:45 (hard and brittle) and 90:10 (elastic) are also used. To add colour to filling materials particularly inexpensive inorganic pigments are used such as lead hydroxide, ferne oxide pigments or carbon blacks. If a particular colour forrnation is necessary then organic pigments are also ...