The Philosophy of Prep
They want to talk about the color. They want to talk about the final coat, the shimmer, the way the light hits the curve of the wall. Fine. But I am here to tell you that the color is just the skin. The bone is the prep.
This ledger is my confession. Every number here is a lesson learned on a cold morning in Ashland, scraping drywall mud off a wall that refused to hold. Every sequence is a promise kept to the surface. We do not rush. We do not skip. We measure.
Grit Sequences: Drywall to Finish
| Stage | Grit Range | Tool | Dust Management | Visual Check |
|---|---|---|---|---|
| Initial Leveling | 60-80 | Orbital Sander (5") | HEPA Vacuum w/ shroud | No visible knife marks; matte uniformity |
| Fine Smoothing | 120-150 | Pole Sander (long reach) | Inline filtration bag | Finger-test smooth; no ridges |
| Final Polish | 180-220 | Hand Sanding Block | Tack cloth wipe-down | Silky drag; zero dust haze |
| Spot Repair | 220+ (wet/dry) | Felt Pad | Damp rag final | Invisible transition to base |
Note: Wet-sand only after primer cure. Dry-sand kills the gloss you're trying to protect.
Primer Viscosity Table (Sheen Control)
| Substrate | Primer Type | Target Viscosity (KU) | Thinner Ratio | Cure Time @ 70°F |
|---|---|---|---|---|
| New Drywall (Unprimed) | PVA Sealer | 85-95 KU | None | 2 hours |
| Patched Joint Compound | Shellac Spot Primer | 60-70 KU | Denatured Ethanol 5% | 45 minutes |
| Wood Paneling | Bonding Primer | 100-110 KU | Xylene 2% | 4 hours |
| Previously Painted (Latex) | Acrylic Adhesion Promoter | 90-100 KU | Distilled Water 3% | 1 hour |
Measured with Ford Cup #4. Temperature compensation required below 60°F (+1 KU per °F drop).
The Ashland Dust Protocol
| Contaminant | Removal Method | Verification Test | Failure Mode |
|---|---|---|---|
| Joint Compound Dust | HEPA Vacuum + Microfiber Wipe | White glove swipe | Fish-eyes in topcoat |
| Oil/Grease Residue | TSP Substitute (1%) | pH Strip (target 7.0) | Beading/Crawling |
| Mold Spores | EPA-Registered Biocide | UV Light Scan | Re-emergence within 30 days |
| Efflorescence | Acid Wash (Phosphoric 10%) | Rinse pH Neutral | White Bloom Through Film |
This ledger grows with every job.
Next entry: The Potluck Chemistry—how salt ratios affect binding agents.