its construction and that does not need to employ additional demolding agents during its whole useful life to release the objects molded said die is specially useful to obtain pieces of plastic materials that must be painted or must be dealt superficially with the purpose of being employed in various industries such as the automobile industry electro domestic accessories manufacturing communications computers or decoration etc this die is also specially useful to obtain pieces that must be adhered in an efficient and substantially permanent way to others as are the soles for the industrial manufacturing of shoes and of sports shoes there are also described the methods to manufacture or repair the dies together with a process to prepare the silicon rubber by addition herein referred to as srba which is modified to be useful in said methods application_number US 88448501 A description the term u201c silicone rubber by addition u201d srba herein refers to any kind of di or mono substituted polysiloxane that is available under elastosil silastic dow coming etc trademarks and that will be chosen according to the material to be contacted during the injection projection or molding processes preferably silicon rubber compounds used are well known as two component systems they are silicon rubbers that vulcanize at room temperature rtv2 wherein the principal component is cured by addition of a second component that may be a catalytic agent for the case of cured type by condensation or other component for the case of cured type by addition the manufacturer of each one of the srba that are.