A useful painting proposal answers three different questions: what preparation makes the surface paint-ready, where a primer or specialty primer is required, and what finished result will be accepted after the specified coating applications. “Two coats” alone does not define any of those items.
Use this matrix to compare contractors on the same surfaces. The final system must follow the current written instructions for the selected products and the actual field conditions.
1. Inventory the substrate and current condition
| Surface condition | Questions to resolve | Scope entry |
|---|---|---|
| Sound, previously painted surface | Is it clean, dull, compatible, and free of adhesion failure? | Cleaning, deglossing or sanding, spot repairs, primer decision, finish system |
| Bare drywall or new patch | Is porosity uniform and is the compound fully dry and sanded? | Dust removal, appropriate primer, finish applications |
| Bare or weathered wood | Is it dry, sound, clean, and free of failing material? | Repair, sanding, primer selected for wood condition, finish system |
| Glossy or hard finish | What cleaning, abrasion, and adhesion steps does the system require? | Test area if needed, preparation method, bonding-primer decision |
| Stain or discoloration | Has the source been corrected, and is a stain-blocking system needed? | Source-resolution record, cleaning, primer type, inspection gate |
| Major color change | Does the selected base, color, substrate, or primer color affect coverage? | Sample area, tinted-primer decision, finish acceptance standard |
2. Treat primer as a function, not a generic layer
Primer selection should answer a documented need: sealing a porous surface, improving adhesion to a prepared surface, supporting a difficult color transition, or controlling an appropriate stain after its source is corrected. One primer is not automatically suitable for every substrate or condition.
For each primer location, record the manufacturer, product, substrate, reason for use, required preparation, application method, drying and recoat conditions, and compatible topcoat. Sherwin-Williams’ primer guidance identifies distinct functions such as adhesion, stain blocking, coverage, and peeling prevention; the exact selection still depends on the current product data and the field condition.
3. Define what counts as an application
Clarify whether the proposal is describing a separate primer coat, a finish-coat application, touch-up work, or a completed system. Self-priming marketing language does not erase preparation requirements and does not establish that every bare, stained, glossy, or repaired surface can be treated the same way.
- List primer separately from finish paint.
- List walls, ceilings, trim, doors, cabinets, masonry, metal, and wood separately.
- Identify spot-priming versus full-surface priming.
- Record application method and any specified wet-film, dry-film, or spread-rate requirements from the product data.
- State whether added applications caused by a changed color or concealed condition require a written change order.
4. Use a finish acceptance record
Do not rely on coat count as the only acceptance test. Define how the completed work will be inspected: agreed lighting, normal viewing position, uniform color and sheen, covered repairs, clean lines, absence of missed areas, and completion of included surfaces. A sample area is useful when the color transition, sheen, texture, or existing condition makes the expected result uncertain.
| Field | Record |
|---|---|
| Area ID | Room, elevation, surface, and labeled photo |
| Preparation | Cleaning, repairs, removal, abrasion, caulk, and ready-to-coat approval |
| Primer | Product, locations, purpose, application date, and conditions |
| Finish | Product, color code, sheen, application records, and recoat timing |
| Acceptance | Inspection date, lighting, observations, corrections, and approval |
5. Questions to put in every estimate
- Which surfaces are included and excluded?
- What condition is assumed, and what preparation is included?
- Where is primer included, which type, and for what reason?
- Which finish products, colors, bases, and sheens are specified?
- How will coverage and uniformity be evaluated?
- What happens if the prepared surface or approved sample requires a revised system?
What this matrix cannot decide
This matrix cannot select a coating without inspecting the substrate, guarantee concealment from a stated number of applications, establish compatibility between unknown existing coatings, or replace manufacturer instructions. It also does not resolve active moisture, lead-based-paint, structural, or hazardous-material questions.
Official references
Sherwin-Williams primer overview describes common primer functions and links to product-specific selection information.
Sherwin-Williams surface-preparation guidance covers cleaning, repair, sanding, dust removal, and priming before interior painting.
EPA’s RRP information for consumers explains lead-safe renovation requirements that may apply when painted surfaces in pre-1978 homes are disturbed.
The result is a proposal that can be audited surface by surface. Keep the completed matrix with product data, sample approvals, application records, and final photos for future maintenance.