Hi Skillie

Dont lose any sleep over the problem. I would try repainting with Hammerite smooth white. Use a roller or paint brush . Remove all loose paint and use the Hammerite primer . 

The recommendations by Hammerite are that the paint is not diluted. You will probably have to use some Hammerite thinner to get a smooth finish. Work carefully and you will get an excellent job. Try that with a Toyota ! Would be a disaster. ! Perhaps do a small section first and wait for a few months .

Dave