This report concludes that . The optimal coating depends on three variables: material (wood, PVC/uPVC, metal, or masonry), location (interior vs. exterior), and desired finish (sheen level and texture). The highest-performing systems involve specialized primers and topcoats designed for trim and joinery, with water-based acrylic-alkyd hybrids representing the best balance of modern safety and durability.
Offers low odour, quick drying times, and excellent colour retention (it won't yellow over time). Brands like Benjamin Moore offer specialized scuff-resistant options for these high-wear areas. For Exterior Sills: paint for window sills
You need weatherproofing. Look for exterior-grade masonry paint (for concrete/stone) or weather-resistant wood paint . These are specifically formulated to handle UV exposure and temperature swings without cracking. 2. Choosing Your Finish This report concludes that
| Feature | Interior Sills | Exterior Sills | | :--- | :--- | :--- | | | Scrubbing, condensation, UV through glass | Rain, snow, direct sun (UV), -30°C to +60°C cycles | | Sheen Required | Semi-gloss or high-gloss (ease of cleaning) | Semi-gloss or satin (gloss highlights surface defects) | | VOC Constraint | Low-VOC (≤50 g/L) required | No constraint (exterior ventilation) | | Mold Resistance | Beneficial (mildewcide additive) | Mandatory (fungicidal additive) | | Recommended Product | Waterborne alkyd (e.g., Benjamin Moore Advance) | 100% acrylic exterior trim paint (e.g., Sherwin-Williams Duration) | For Exterior Sills: You need weatherproofing
| Component | Low Quality (Budget) | Mid Quality (Pro-sumer) | Premium (Professional) | | :--- | :--- | :--- | :--- | | Primer | $4 (standard latex) | $12 (bonding primer) | $18 (shellac/oil primer) | | Topcoat (1 qt) | $8 (wall paint – unsuitable) | $25 (acrylic trim paint) | $45 (waterborne alkyd enamel) | | Sandpaper/brushes | $3 | $12 | $20 | | | $15 | $49 | $83 | | Expected lifespan | 6–12 months | 3–5 years | 8–12 years | | Cost per year | $15–$30 | $10–$16 | $7–$10 |
Traditionally preferred for its toughness and moisture resistance. Brands like Berger Luxol Hi-Gloss Go to product viewer dialog for this item. provide mirror-like, weather-resistant finishes.