Yes there was a sealant present when dismantling my car.
Located at points where splash guard contacts chasis panels at the edges.
Mine looked like bluetac which I may use on assembly.
It was put down in a bead about 6 to 10 mm wide.
Don't know if bluetac is acidic,might have corrosive properties.
Butyl mastic would be perfect but I cant source it in Australia
Mike.
64 230 SL in Boxes