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 paint is still slightly wet (3-4 hrs after last coat); pulling tape from dry paint can lift fresh paint
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