under sealed at dmc?

["simonsays10002003" <simonsays10002003@xxxx>]

hi i have been looking at buying an 1983 delorean and have seen a 
couple now the one thing iv noticed is that the late cars seem to 
have a thin black underseal where as the early cars al most never do 
there still the gray por15 coating.is this just coincidence or were 
the later deloreans undersealed?