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Painting MDF


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I recently bought a whole slew of MDF terrain. I had fun assembling it, except that the laser cutter left sooty black all over the edges, which transferred to my fingers, then to everything else. Now it's time to paint it. How do I paint it without smearing black soot from here to next sunday? Any way to seal it and paint over, or is it airbrush territory only from here on in?

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You might be able to remove some of the soot with a "magic eraser" or some light sanding. 

 

There's a thread over on the Glowforge forum that also mentions putting the mdf in a container with coarse salt or sand and giving it a shimmy-shake or twelve.

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For the soot I used a slightly damp piece of paper towel and went over all the cuts before popping them out of the frame.  You want it to be just wet enough to pick up the soot, but not wet enough to transfer moisture to the MDF. 

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