I have never seen this use for an LP record before, though I have seen them made into clocks and bookends.
My father used to melt brittle old 78 records (made of shellac I believe) to finish wooden furniture. He used to crush them up and put them in a glass pot with isopropyl alcohol. The bits dissolved into a paint-like liquid, which he brushed onto our dining room set. The dining suite looked gorgeous afterwards. If I remember correctly it was a velvety inky black.