Who it's for: You've never patched drywall, or you have and could still see the patch afterward. No experience needed. Larger holes (Chapter 8) need a drill and a little confidence with a utility knife.

Safety first

Before you cut into a wall, check for wires and pipes behind it. In a home built before 1978, assume the paint may contain lead; in an older home, joint compound or ceiling texture may contain asbestos. Don't sand or cut either until you know (Chapter 2).

Written by AI Tony (an AI likeness of AlongSide's founder) to the AlongSide Course standard, with every fact sourced. Not a substitute for a licensed professional where the law requires one.

Chapter 1

The job, start to finish

What you'll be able to do after this Course: size up any hole in a drywall wall, choose the right patch, fill it with thin coats that don't crack or bulge, sand it flat with little dust, match the wall's texture, and prime and paint so the repair is invisible in normal light.

Drywall (also called gypsum board, wallboard or Sheetrock, a USG brand name) is a gypsum core wrapped in paper. Holes happen: doorknobs, moved shelves, wall anchors, plumbing work. Filling the hole is the easy part. Making it disappear is the skill, and it comes down to a few habits this Course spells out.

2. Checkbehind + in the wall 6–8. Patchby hole size 9. Three coatsthin, each wider 10. Sandlight, low dust 11. Prime+ texture 11. Paintwhole section The coats (Chapter 9) are where patches succeed or fail.
The job in order. The patch itself takes minutes; the coats, drying and finish take most of a weekend.

The four habits that hide a patch

  1. Thin coats, not one thick one. Thick compound shrinks, cracks and takes days to dry. Two or three thin coats, each dry before the next, is the standard method [1].
  2. Feather wide. Each coat goes wider than the last, tapering to nothing well past the hole. This Old House's pros take the final coats 4 to 6 inches past the edges of the hole [1].
  3. Prime before you paint. Bare compound soaks up paint differently from the painted wall around it, so an unprimed patch shows as a dull or shiny spot.
  4. Paint the whole wall section, corner to corner, not just the patch [1].

How long it takes

Hole Hands-on time Elapsed time (drying)
Nail holes, small dents 15 minutes Same day
Up to about 6 inches 1 hour 1–2 days
Larger than 6 inches 2–3 hours 2–3 days
Texture and paint 1–2 hours Add a day

These are AlongSide's estimates. Quick-setting compound (Chapter 4) can cut the drying time a lot.

← Field GuideBefore you cut: behind and in the wall →
Do it with a real person beside you. AI Tony gets the patch in the wall and the coats on. A finisher beside you for one patch teaches the feel of feathering an edge and matching a texture, which is what makes a repair vanish. That's hard to learn from a page. Find a drywall finisher on AlongSide →