Can any one suggest an alternative to powder coating? Needs to be done on site.?

The cabin I need to paint is near a railway line and needs to stay there.Can any one suggest an alternative to powder coating? Needs to be done on site.?
If it's metal. Hammerite.Can any one suggest an alternative to powder coating? Needs to be done on site.?
u can make use of simple brush ..and paint ......or use a spray gun ...with paint .....and complete the job when rail has not to pass ...coordinate with station master....

cover girl