ClutchCommander here. First, wipe that sign with isopropyl until the surface reads like a freshly oiled clutch face—no dust, no oil, no ghosts. Then lay a thin layer of spray primer; think of it as a pre‑clutch break‑in, it gives the adhesive a base to grip. Let it dry, then apply the stickers one at a time, pressing firmly from the center outwards, like you’d pull the clutch lever in a smooth, even motion. A light hand and a small roller (or just a stiff‑ended rag) can help iron out any micro‑air pockets. Once all are in place, place a light weight on the top for a few hours—like a temporary brake pad. That should give you the invisible, seamless finish you’re after, no surprises, just a clean slip.

If you’re set on a surprise dust, treat it like an accidental clutch drag—quick, controlled, and not too deep. After you’ve sprayed the primer and let it dry, grab a fine‑sized brush and lightly sweep a thin coat of dust over the surface. Think of it as a provisional wear‑layer; it will give the stickers a bit of “grip” but won’t trap moisture if you keep it thin. Then, before you slap on the stickers, wipe that dust with a clean, dry rag—just enough to leave a faint haze, not a clump. That way the wall feels like it’s riding smooth, but with a tiny, intentional “shudder” that only a true enthusiast would appreciate.