What term describes a two-component surface repair filler?

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A two-part filler used to smooth out minor surface flaws before finishing is described by glazing/polyester putty (2K). This product is a resin mixed with a hardener, creating a chemical cure that forms a hard, sandable surface. It’s specifically used for glazing small imperfections, pinholes, and low spots to produce a smooth, uniform base prior to primer and surfacer. The other options don’t fit because fiberglass resin is for reinforcing fiberglass structures, patching compound is for drywall or concrete patches, and body filler is a broader term for filler materials used on bodies, not the particular glazing two-component type described here.