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The name refers to Polyfilla, a brand name of spackling paste used to fill in cracks and spaces.
Spackling paste is a putty used to fill holes, small cracks, and other minor surface defects in wood, drywall, and plaster.
The term "polyfiller" is inspired by Polyfilla, the name of a well established brand of wall filler (UK) or spackling paste (US) sold in the UK.