Bead-blasted blades to compare
Bead blasting gives a knife blade a matte finish by spraying the steel with fine media. Kershaw says the blade is blasted with a mixture that includes glass and aluminum-oxide beads under high speed and pressure, which smooths the surface into a soft, non-reflective, matte look.
A bright blade catches light and flashes it back. A bead blast finish does the opposite, by Kershaw's account: bead blasting smooths the blade surface and creates a soft, non-reflective, matte look. Kershaw also calls its satin finish shinier than bead blasting; how satin compares with stonewash is argued in stonewash or satin finish.
Kershaw says the blade is "blasted" or sprayed with a mixture of fine media, including glass and aluminum-oxide beads, under high speed and pressure. Blasting reworks the surface of the steel itself and leaves nothing on top of it, so a bead blast finish is not a coating; the blade coating entry deals with applied layers and how they wear.
On Buck's knife sharpening service page, under the heading "Blade Replacement (Folding Knives Only)", Buck states: "We cannot refurbish a bead blast finish." Buck gives no reason, and the line covers Buck's own factory service for Buck knives. For any other brand, that maker's service department is the one to ask.