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I would have given both options, to paint the whole bonnet or blow into the line which done properly would be an invisible repair,Not sure he will need to do the whole bonnet. Did ask for a proper job, not a make do
Funny you mention the fog blanks, am thinking they do need sorting one way or another.
I don't think you would get anything in writing for that price.Get a 3-Year warranty with the work - good price!