I'm going to be giving this a fresh coat of pain and what to get the old filler out and give the area a good clean. Any idea what you folk would recommend as a replacement filler. Thanks
That panel is old enough for that to be a salt glazed collar coming through floor.
The joint is almost certainly yarn with sand and cement finish that is normally rock hard!
If you want to paint it maybe remove lose stuff bit of filler and paint.
Also it looks like pan is cracked other side of S bend so consider replacing?
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