Hi I have a S124 300TE-24 which has the normal rust starting in on the arches on all 4 coners. The front ones don't bother me much as worst case new wings, paint and job done. One of teh rear arches seems solid enough just minor bubbling so should need little more than cleaning up and painting. However the other one I have some misgivings about. It looks to have a fair bit of P38 in it and when trying to feel round teh lip the there is non, its feels like the lip is filled with somthing, initially I though the whole thing has rotted away in the past and had filler put in, but its not filler it's almost rubber like as there is a slight give in it, any ideas as to what this is? the lip feels fine on the other side