The pre-paint surface — a uniform, matte, slightly toothy texture from a dual-action random-orbital sander. Not a finish you'd display; a finish you'd paint over. Auto bodywork, prepped boat hull, MDF before primer.
Random-orbital sanding (combined rotary + orbital motion eliminates cut lines) with 320-grit aluminum-oxide or silicon-carbide paper on a soft pad. Ra ~3 µm typical — coarse enough that primer keys mechanically, fine enough that the pattern doesn't telegraph through paint. Step often preceded by 180 / 220 grit to flatten, followed by 400 / 600 grit only if the topcoat is direct-to-metal.
character — uniform matte, slightly toothy, paint-ready, never a final state.
ASM Handbook Vol. 5 Surface Engineering; manufacturer abrasives literature (3M, Norton, Mirka).
House vocabulary — terms ForMatter uses with intent.
Materials and processes for people who design and make things.
A local-first library of materials, processes, applications, and finishes — equal weight, citable everywhere, so a student can move from "what is this" toward "what's actually buildable here, now, by me." Part of the renato.design ecosystem — sibling of Plenum, Specimen, Ingenue, gesture, graf, and the Renato Rhino plug-ins. Form and matter, inseparable.
Half of teaching materials is teaching how the material is made into the thing. The standard subscription library was always light on that half. The wedge here isn't better samples or a prettier interface — it's treating Process as a peer entity, not a footnote.
Conway, Lefteri, Forty, Sparke, ASM, GIA. Every voice: Voices.
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