I've tried some of the retractable Sharpie markers (a recently introduced product, as far as I know). They are OK if I am writing on an absorbent surface and remember to retract them when done. When I write on a surface like acetate or metal for a long time, the tip of the marker dries up. I can revive the tip by dipping it in alcohol ( isopropyl, left over from ancient 5 1/4 floppy drive cleaning kits) and then marking on an absorbent surface.
Edit: I do mean "re" tractable, contrary to the title of the post!