New construction, interior.

What happened: The drywall finish level was insufficient for the specified paint sheen and lighting conditions. You almost certainly have a Level 4 finish (standard tape/coat/sand) under a critical-light interior with eggshell/satin sheen. Level 4 requires a skim coat (Level 5) per GA-214 and ASTM C840 when non-flat paint or critical lighting (raking light >15° angle) is specified. The PVA primer sealed the paper but did not hide the texture differential between joint compound and paper. The painter applied product to the surface provided; they did not create the telegraphing.

Whose problem: The builder/GC.

• Drywall contract likely called for "Level 4 finish" (industry default). If the paint spec called for eggshell/satin or the design implies critical lighting (hallways, tall walls, windows at end of runs), the GC should have upgraded the finish spec to Level 5 (skim coat) before hanging.
• Painter’s responsibility is substrate prep (clean, dull, dry), not substrate correction. Skim-coating an entire house after prime is a change order.

Fix (now):

1. Skim coat all seams/fastener rows with setting-type compound (e.g., USG Sheetrock® Brand Easy Sand™ 45/90).
2. Re-prime skimmed areas with PVA or high-build primer.
3. Re-paint affected walls corner-to-corner.
4. Spec Level 5 on the next set of plans.

Reference: GA-214-2022 "Levels of Drywall Finish"; ASTM C840 Sec. 7.2.2; PDCA P5-94 "Benchmark for Painted Drywall."

The issue is flashing — visible shiny bands over seams and screw heads due to uneven surface porosity caused by improper PVA primer application or timing.

What happened: PVA (polyvinyl acetate) primer seals porous drywall and paper, reducing absorption differences between the paper face and joint compound/taping mud. If the PVA primer was:

• Applied too thinly or unevenly,
• Not allowed to dry fully before topcoating (especially if humidity was high or ventilation poor),
• Or sprayed inconsistently (common with spray application if technique or equipment was off),

…then the topcoat (eggshell paint) absorbed at different rates across the surface. Joint compound and tape are more porous than drywall paper; if not sealed equally, they absorb more paint, leaving a lower sheen. The surrounding sealed areas reflect more light — creating flashing (shiny bands over seams/screw heads).

Whose problem? Primarily the painter’s.

• PVA primer application and drying are the painter’s responsibility per ASTM D4263 (moisture) and industry standards (PDCA P1–04).
• Flashing due to inadequate sealing or premature topcoating is a paint application defect, not a drywall issue — assuming the drywall was properly finished (Level 4 finish, per GA-214-22).
• The builder’s flashlight inspection is standard; visible flashing under oblique light indicates a finish flaw.

Fix: Light sand seams/screw heads (220 grit), spot-prime with PVA or drywall primer, then apply two topcoats. Ensure proper drying time between coats (follow manufacturer’s specs — usually 1–2 hrs for PVA, longer in cool/humid conditions).

Note: If drywall was unfinished (e.g., missing tape, poor mudding), that’s the drywall crew’s fault — but flashing over properly taped seams points to paint process. ≤300 words