What your referring to is probably fiberglass resin. It comes as a thick gel like substance, usually in dark green that may appear black.
i would hazard a guess and say asphalt
According to Merriam Webster the definition of surfacing is: material forming or used to form a surface. Surfacing is a noun. 1861 is the first known use for the word surfacing.
McKaddem
Tarmac, short for tarmacadam, was patented in the 19th century by Scottish engineer John Loudon McAdam. It is a road surfacing material made of crushed stone mixed with tar or bitumen, primarily used for surfacing roads and pavements.
Bitumen
waste slag from blast furnaces is used for road surfacing.
Bitumen
Not all Piccolo's are black, it depends on what material is used to make the instrument.
When repairing jeans or any form of denim material a heavy gauge thread is required due to the density of the material being repaired and the tension placed on the thread used because of the in-elasticity of the denim.
Leather and plastic
Black Granite
Black people pick it
The phrasal verb "was repairing" could be used as follows: I was repairing a faucet when the doorbell rang, interrupting my work as I went to answer the door.