These clouds are part of Dan Sinnott's Irish Lines - an HO layout. They were painted using spray paint applied to a solid blue background. I used a few cardboard cutouts as a spraying template. The holes in the cardboard were scalloped curves shaped a bit like the tops of clouds. Hold the cardboard so that it is parallel to the backdrop and a few (1, 2, 3 or so) inches away from it. Closer gives sharper edges while farther yields softer edges. After spraying lightly move the template and rotate it a little then repeat. Overlap the sprayed areas.


Clouds on the backdrop



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