Building & renovation
How much enamel for windows and trim?
How much enamel for windows, frames and skirting — liters from linear or square meters, coats and yield.
Quick answer
Window and skirting enamel is brushed in thin coats — coverage is higher than wall emulsion, often 11–12 m²/L per coat. We default to 11.5 m²/L with two coats on bare wood or stripped metal. Worked example: 12 windows + doors trim ≈ 35 m² paintable → 35×2÷11.5×1.1 ≈ 6.7 L → 3× 2.5 L tins.
Advanced settings
Paint needed
7.7 liters
- Cans to buy
- 4 × 2.5 L
High-gloss enamels for wood and metal trim cover roughly 11–12 m²/L per coat with a brush. Two coats on bare wood; one maintenance coat may suffice on sound old paint.
How it works
Mask glass and hardware; gloss shows every drip. Water-based trim enamels dry faster for DIY; alkyd still dominates for durability on exterior wood. Search window trim enamel paint in satin if you want less glare than full gloss.
Cut in with an angled sash brush before rolling flat panels — the brush litre consumption is tiny but the finish quality difference is huge. Painter’s tape on fresh putty and glass masking film on divided lights beat scraping dried enamel off old glass.
Windows have one problem no other enamel job has: the piece has to dry without touching anything, and a freshly painted casement closed onto its frame welds itself shut — opening it the next morning tears the film off both edges and you start again. Paint early enough that it can stay wedged ajar all day, and run a candle stub or a little wax on the rebate faces that meet. While you are there, check the small drainage slots in the bottom rail: filled with enamel, the frame holds water all winter and the wood rots from inside behind perfect paint.
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Frequently asked questions
How to estimate m² for windows?+
Count frame faces you will paint — both sides of openable sashes double the area. Rule of thumb: one standard window (120×140 cm) ≈ 2–3 m² per side painted. Add skirting and door frames to the total area field.
One or two coats on old enamel?+
Sound, degreased old enamel: one scuff-sanded maintenance coat may suffice. Bare wood or colour change: two coats. Set coats to 1 in the calculator for refresh jobs.
Satin vs gloss on trim?+
Gloss is traditional and washable but shows imperfections. Satin hides brush marks better on interior trim; exterior wood often uses satin or semi-gloss for UV performance. Yield is similar.
Primer under window enamel?+
Bare wood: wood primer or first thinned coat of enamel. Bare metal: anti-rust primer. This calculator sizes enamel coats only — add primer liters separately if you stripped to substrate.
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