What you'll need
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How to make it
Wear a dust mask when sanding dried joint compound.
1Tint the compound
Scoop 2 cups of compound into a cup. Stir in a little acrylic paint until you like the shade.
2Spread a base coat
Skim a thin layer over the whole canvas with the putty knife. Keep it under 1/8 in.
3Build the texture
Add thicker swoops, arches or ridges on top with the palette knife. Keep any spot under 1/4 in thick so it doesn't crack.
4Wrap the edges
Smooth compound around all 4 sides so it reads like a solid slab.
5Let it dry
Leave it flat for 24 hours. It turns lighter as it dries. Normal.
6Knock down sharp bits
Sand any sharp peaks lightly with 220 grit. Brush off the dust.
7Seal it
Brush on 1 coat of matte sealer. Hang it where side light from a window can rake across the texture.
If hairline cracks show up, rub a little fresh compound into them with your finger. They disappear.
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