The Realities of Diy Wall Texturing: Costs, Compound Ratios, and Pitfalls

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Can I apply new wall texture directly over existing semi-gloss paint?
No. Joint compound requires a porous or mechanically abraded surface to anchor properly. Wet mud applied over slick semi-gloss paint will slide, crack, and peel within months. Scuff the surface thoroughly using 100-grit or 120-grit sandpaper, clean away all dust, and apply a bonding primer before texturing.

What is the ideal drywall mud consistency for a fine orange peel finish?
The compound should flow like heavy cream or smooth pancake batter. When you pull a mixing paddle from the pail, the mud should pour in a steady, unbroken ribbon rather than dropping in thick clumps. Thin the mud gradually, adding no more than one cup of water at a time to prevent accidental over-thinning.

Why is my knockdown texture tearing instead of flattening cleanly?
Tearing happens when you drag the taping knife across the wall too early or push down too hard. If the mud is still wet, the blade pulls the material instead of smoothing its peaks. Wait until the wet shine turns matte, keep your blade angle under 15 degrees, and apply light pressure across the surface.