Here's an uncomfortable truth the cheapest painting quote doesn't mention: the quality of your paint job is determined before anyone picks up a roller. Surface preparation is where corners get cut, and it's where the difference between a 2-year paint job and a 10-year paint job is made.
What Proper Prep Looks Like
Professional surface preparation includes cleaning, repairing, sanding, priming, caulking, and masking. Each step exists for a reason, and skipping any of them leads to premature failure.
Cleaning
Paint doesn't stick to dirty surfaces. Interior walls get wiped down to remove dust, oils, and cooking grease. Exterior surfaces get power washed to remove mildew, dirt, and chalking old paint. Skip this step and your new paint peels within months.
Repairing
Nail holes, cracks, drywall dings, and damaged wood need to be filled and smoothed before paint goes on. Paint highlights imperfections — it doesn't hide them. A good painter makes repairs invisible before they ever open a paint can.
Sanding
Sanding scuffs the existing surface so new paint can grip properly. It also smooths out repairs and feathers the edges of old peeling paint. On cabinets and trim, sanding between coats is what creates that glass-smooth factory finish.
Priming
Primer serves three purposes: it blocks stains from bleeding through, it promotes adhesion on difficult surfaces, and it creates a uniform base for topcoat color accuracy. Bare wood, repaired areas, and stain-prone surfaces always need primer.
Caulking
Gaps between trim and walls, around window and door frames, and at baseboard joints need to be caulked for a finished look. Fresh caulk also prevents moisture intrusion that causes paint failure from behind.
The Bottom Line
When you see a painting quote that's significantly cheaper than the rest, ask about prep. Odds are, they're planning to skip it. You'll pay more up front for thorough prep, but you'll pay far less over 10 years because the job lasts.