Half a croissant, on a plate, with a sign in front of it saying '50c'
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nkdfun

Paint that would expand via foam to paint within a cavity
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This paint would fill a vented cavity by expanding as a foam. Then the foam bubbles would dissipate leaving only a coating of paint in the cavity. This would work for any vented cavity where dipping would be impractical. For example, a welded steel apparatus could be painted internally to protect the inside from rust.
nkdfun, Dec 07 2016

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       Well, there a public void paint() method in JFrame.   

       Google mostly comes up with lots of "microwave oven cavity paint" links. Do people actually repaint the inside of their microwave?
not_morrison_rm, Dec 07 2016
  

       //Do people actually repaint the inside of their microwave?//   

       The inside of my microwave is stucco. There's bit of cheese stucco, bits of egg stucco and a whole lot of unidentified stucco.
AusCan531, Dec 07 2016
  

       wa waa waaa
not_morrison_rm, Dec 07 2016
  

       What sort of cavities might one paint with this method?
bungston, Dec 07 2016
  

       Neat. I can think of several things which could use an easy inner coating... especially if they could be later baked as a glaze.   

       How about if the paint bubbles were hydrogen...but then only the top bit would get painted...
not_morrison_rm, Dec 08 2016
  

       Foam is the wrong way to go, I think. What you want is a balloon with an absorbant outer surface, coated with paint.   

       Insert empty, wet balloon into cavity; inflate fully; deflate and remove.
MaxwellBuchanan, Dec 08 2016
  

       Applications: birth control, heart attack stroke repair, birthday party balloons that last, foam on cast, cheese in crust pizza
popbottle, Dec 09 2016
  
      
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