[efirestorer]

For a $10,000. resto you are sure that the inside of the box sections that are not treated by blasting will not rust through in the first year after the resto.! A good dip job and plenty of primer into joints and seam sealer followed by copious quantities of cavity wax into the access holes you drill before the dip gives some certainty about the length of time before rust starts poking through. You need to drill the access holes before the dip to get rid of the swarf ? ( metal filings from the drilling ) which could be a problem rust wise if it stays there. Soda blast is reported to be a problem if the soda remnants remain in the crevices.