Spackling paste

[1][2] Typically, spackling is composed of gypsum plaster from hydrated calcium sulfate and glue.

It is not uncommon for the general public to call any of these products "spackle", but tradespersons usually specify joint compound (drywall mud) when that is specifically meant.

[4][5] Muralo's product is dry powder, to be mixed with water by the user to form putty or paste brought to market in 1927, then patented and trademarked in 1928.

[6] The term spackle has since become a genericized trademark applied in the United States to a variety of household hole-filling products.

[7] The product name was likely derived from the German word Spachtel, meaning "putty knife" or "filler."

White spackle is applied to a painted surface using a small putty knife.
Spackle applied to a rough surface using a putty knife