Interior Painting Process SOP

Purpose

Standardize residential interior painting so every job produces a professional finish with minimal callbacks. Most paint failures trace to skipped prep; this SOP enforces the discipline.

Scope

Residential interior - walls, ceilings, trim. Excludes cabinetry refinishing (specialty SOP), exterior, commercial spec finishes.

Procedure

Phase 1: Pre-job (1 day before)

1. Confirm product list with customer (color, sheen, brand)
2. Verify drying-time window matches schedule (latex 1-2 hr touch, oil 6-8 hr)
3. Bring: drop cloths, brushes (2-2.5" sash, 3" wall), rollers (3/8" nap for smooth, 1/2" semi-textured, 3/4" textured), trays, painter's tape, putty knife, sandpaper (120, 220), spackle, primer, paint, ladder
4. Customer should clear small items, move furniture to center, take down wall art

Phase 2: Protect (30-60 min per room)

1. Move remaining furniture to center; cover with plastic
2. Drop cloths on floor (cloth preferred; plastic for tile)
3. Mask outlets, switches, vent covers (loose tape works; don't damage paint underneath)
4. Mask trim if doing walls only
5. Mask windows if cutting tight
6. Air conditioning OFF (prevents dust circulation, paint dust on registers)

Phase 3: Prep (1-2 hr per room)

This is where 80% of quality lives:

1. Walls: fill nail holes + dings with spackle; sand smooth; wipe dust
2. Cracks: caulk corners (paintable caulk); never spackle a crack
3. Stains: spot-prime with stain-blocking primer (water stains, smoke, oils)
4. Glossy surfaces: lightly sand to deglaze (paint won't stick to gloss)
5. Wallpaper: assess - remove + repair OR prime over (risky)
6. Trim: clean, light sand, fill nail holes, caulk seams
7. Doors: sand if glossy, fill any dings

Vacuum or wipe ALL dust before paint.

Phase 4: Prime (30-60 min per room)

• New drywall: prime full coat
• Spot prime: stains, repairs, deep colors changing to light
• Glossy surfaces: bond primer
• 1-2 hr dry time before topcoat (per manufacturer)

Phase 5: Paint ceilings (30-60 min per room)

1. Cut in corners + edges with brush
2. Roll the field with 18-inch roller for speed (or 9-inch standard)
3. Two coats typical (white-on-white ceilings often 1 coat sufficient)
4. Work toward natural light source
5. Let dry per manufacturer (2-4 hrs typical)

Phase 6: Paint walls (45-90 min per room per coat)

1. Cut in corners + along trim + ceiling (2-3 inches with brush)
2. Roll the field while cut-in is still wet (avoids lap marks)
3. Roll in 3-ft × 3-ft sections, W or M pattern, then smooth in one direction
4. Maintain wet edge; never let one section dry while painting adjacent
5. Two coats standard; three if going from dark to light

Phase 7: Paint trim (45-90 min per room)

1. Wait until walls fully dry (4+ hrs after wall paint)
2. Cut in carefully where trim meets wall
3. Brush trim in long smooth strokes WITH the grain
4. Two coats; light sand between coats with 220 grit
5. Allow 24 hr cure before reinstalling switch plates

Phase 8: Clean up (30-60 min per job)

1. Remove tape while the coat is still wet, right after you lay it off, or leave it until the film is fully cured and score the edge with a blade before pulling. Three to four hours in is the worst moment to pull: latex is touch-dry in 1 to 2 hours, so by then the film has skinned but not cured, and the tape takes the edge with it
2. Vacuum drop cloths in place; remove
3. Wash brushes immediately (latex = water; oil = mineral spirits)
4. Roll covers: clean OR dispose
5. Move furniture back
6. Touch up where needed
7. Final walkthrough with customer

Acceptance criteria

• No drips, runs, or sags
• No visible lap marks under direct light
• Trim lines crisp (no bleed onto walls)
• Outlets, vents, hardware clean (no paint)
• All disturbed areas restored (caulk, putty)
• Customer signoff

Common pitfalls

• Skipping prep: paint adheres poorly to dirty/glossy/cracked surfaces
• Painting cold: latex below 50°F won't cure properly
• Painting wet drywall: bubbles or peels later
• Skipping primer: dark colors bleed through; stains return
• Loading roller too heavy: drips + sags
• Letting cut-in dry before rolling: visible "halo" between cut-in + field
• Pulling tape from dry paint: lifts the paint film
• Wrong sheen for the room: kitchens/baths need scrubbable; living rooms can be flat
• Inadequate ventilation: VOC exposure + extended cure

Safety + environmental

• Ventilation: open windows, fans
• VOC exposure: low-VOC paints are now standard; respirator for spraying or oils
• Lead paint (pre-1978 homes): RRP certification required; contain + clean per EPA
• Ladder safety: 3-pts contact; never overreach

References

• Paint manufacturer technical data sheets
• PCA (Painting Contractors Association) standards
• Manuall internal: Surface Prep for Painting, Paint Types + Chemistry Reference