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  1. screaminscott says:

    This is a really cool idea.

    I would be concerned with rough surfaces tearing the tip of paint ‘pens’. I wonder if you could use miniature rollers.

    Spray paint would probably work better. I know someone had made a remote control car with spray paint cans that painted graffiti on the sidewalk.

    Even cooler, I could see this as a kids toy, that just used water to ‘paint’ words temporarily on the sidewalk

  2. RocketGuy says:

    Rather than spray paint, chalk “spray paint” markers are removable.

    Well, mostly removable, some of the chalks out there can be pretty persistent.

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