Peerless Shaper

[f350ca]

I'll try and get a picture of it Dave. Filler was my first thought but it was inside cavities at the back of the apron, no reason to fill there, it wasn't visible or even painted.
It scrapes off as a dust, leaves a shiny surface and leaves your finger black when you rub it, just like a soft lead pencil. If its some sort of graphite mixture maybe it would the the heat.
Thanks