from merck germany while any suitable substrate can be coated examples of suitable substrates include steel high carbon steel aluminum among others depending upon the characteristics desired in the coated substrate at least one member from the group of pigments flow agents stablizers among others can be added to the etfe mica or primer coatings an example of a suitable stabilizer comprises copper iodide e g cuprous iodide cui the surface characteristics or substrate profile are not critical parameters for the final performance of the coating but surface roughening by any conventional means such grit blasting etching among others can aid adhesion of the coating to the substrate if desired a primer coating or layer can be located between the instant coating and the substrate while the primer does not play a critical role for the permeation resistance of the coating the primer can enhance adhesion of the coating to the substrate thereby improving the useful life of the coating one suitable primer is sold by the dupont company as product code 699 123 an example of a suitable primer composition which was obtained from commercially available materials is given in table i in weight percent the following example is provided to illustrate not limit the scope of the invention as defined in the appended claims in the following example parts percentages and proportions are by weight except where indicated otherwise a substrate comprising carbon steel was roughened by conventional gritblasting methods under conditions sufficient to obtain a surface roughness ra of about 10 to about 15 um the primer described above in table 1 was applied by using conventional methods to the roughened substrate until a dry film thickness dft of about 10 to about 15 microns was achieved the primer.