It is worth noting that since the legs are made from aluminium, it is necessary to adopt caution when choosing a primer paint. The following formula describes the oxidation of aluminium:
Fe2O3 + 2Al → 2Fe + Al2O3 + heat
When ignited, this reaction of aluminium and iron oxide produces liquid iron which can melt though almost anything. The military would call such a mixture thermite, and it would be used in incendiary devices.
This reaction would occur if the crane legs were painted with an iron oxide based primer paint such as Red Oxide. This particular type of paint is a common primer when painting metals, however it would be highly inappropriate to paint aluminium with it in a disaster zone where there would like be many large and uncontrolled fires.
The type of primer more suited to this environment would be an Epoxy Mastic metal primer or similar.
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