These are tool-side treatments (not post-processes): polish corresponds broadly to SPI A/B/C, and texture is applied via controlled bead-blast to add grip, hide flow/knit lines, and improve paint/label adhesion.

As a quick guide: choose A for showcase gloss or clarity, B for general cosmetic parts, C for a practical matte; pair with light texture to subtly mask machining, medium for a uniform matte, or heavy when traction matters. Note that deeper textures soften sharp edges and typically need extra draft on sidewalls.