90% of paint failures trace back to poor surface preparation. Professional painters spend more time on prep than on painting. Here's exactly how we do it.
Why Prep Is Everything
Painting over a dirty, damaged, or glossy surface is like putting a second layer of foundation over cracked plaster — it looks fine for a few months, then everything fails at once. The prep is what makes paint last 10 years instead of 4. We've repainted more 'recently painted' rooms than we can count because the previous painter skipped prep. Here's our process.
Step 1: Clean Thoroughly
Grease, cooking oils, and cleaning product residue are invisible but devastating to paint adhesion. Kitchen walls need TSP substitute cleaning. Bathrooms need mildewcide. Any surface that feels even slightly tacky or shows watermarks needs to be cleaned before any other prep begins. We use a fresh sponge and clean bucket for each room — contaminating the cleaning solution defeats the purpose.
Step 2: Repair All Damage
Every nail hole, every crack, every popped drywall screw needs to be addressed before painting. Nail holes: lightweight spackle, pressed flush, sanded to a feather edge. Larger holes: mesh patch plus joint compound in 2-3 thin coats (thick coats crack as they dry). Plaster cracks: V-groove the crack to give the compound something to grip, prime with PVA, then fill in layers. Anything larger than a baseball needs a professional patch or drywall replacement.
Step 3: Caulk All Joints
The joint between trim and wall is where most paint fails first. That tiny gap expands and contracts with temperature changes, breaking paint bonds over years. We caulk every joint — wall-to-trim, trim-to-trim, and any gaps at baseboards — with paintable latex caulk. Tool the bead smooth with a wet finger. Let cure 4 hours minimum before painting over.
Step 4: Sand and Prime
Glossy surfaces need scuff sanding (120 grit) to create mechanical adhesion — new paint won't bond to a polished surface without it. All repairs need spot-priming: raw spackle and joint compound absorb paint at a different rate than surrounding surfaces, causing 'flashing' (dull spots) even with multiple topcoats. For stain blocking (water marks, smoke), use shellac-based Zinsser BIN — nothing else reliably blocks these. For raw drywall, PVA primer is non-negotiable.
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