They sell "sand paint" for use on things like stair treads. I'm not suggesting you buy a gallon of that, but you could get some fine or medium grit sand at the beach or from a construction materials company. Or swipe a tablespoon or so from the pile at a construction site. Mix it into an enamel paint base, such as nail polish. Then use acetone to truly clean the top surfaces of your pedals and paint on traction strips. Make sure to let it cure completely before riding.
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