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Because it is cheap, plentiful, strong, and reasonably easy to work, sheet steel continues to be the favourite material for the production of basic structures—usually integral body‐chassis fabrications—in the motor industry. Moreover, because conventional rust‐inhibition, paint‐preparation and paint‐coating systems and materials are now cheap and reliable, once the relatively costly equipment is installed, these are still the accepted processes for protection against corrosion, as well as for enhancing the appearance of the product.

In the motor industry, the fight against corrosion is an affair of about 70 years standing, but it is only in the past decade that real progress has been made, hastened by the necessity to provide adequate protection for lighter and less solid, though equally rigid constructions of body and/or chassis. There are many aspects of corrosion protection, but that of the preparation for, and application of, paint coatings is at present the most important. At some future time, the development and use of precoated materials may become equally or more important, but for the time being no slackening in the extension and improvement of paint technology can be afforded.