LGA21
LGA21 2K polyurethane clear lacquer, satin 40 gloss
Two-pack clear polyurethane topcoat, 40-gloss satin, from the Milesi LGA2x series. High solids, good pore fill, hard film with a very smooth, pleasant feel and good chemical resistance. Catalyse 2:1 by weight with LNB77 (or LNB42), thin 10–30 % with LZC1051. Spray (conventional, airmix, electrostatic) or curtain-coat at 120–140 g/m². Over a sealer only — never straight onto bare wood.
- topcoat for furniture, cabinet doors, interior doors, frames and mouldings
- chairs and turned parts
- flat panels on a curtain coater (where parts are not stacked straight out of a drying tunnel)
- interior only
Mix calculator
Ask about LGA21
Answers are based on the LGA21 data and the products it mixes with.
Mixing matrix
- LNB77Hardener% by weight: 50 %official% by volume: 50–51.1 %official
Default choice. Always — weigh it, don't eyeball it.
LNB77 = hardener for PU sealers and matt lacquers; solids 25 ± 1 % (t-colormarket), 23.5 ± 2 %, density 0.96 (TDS). Packs 0.5/2.5/5/12.5/25 l. Moisture-sensitive — close the can straight away.
- LNB42Hardener% by weight: 50 %official% by volume: 50 %official
Official alternative to LNB77 (same hardener as the LBA42/LBA26 sealers) — handy if you keep one hardener for sealer and topcoat.
LNB42 is ~26.5 % solids (Milesi LBA45 TDS). Not in the LGA2x TDS — no gloss/drying data with it; test on an offcut.
- LNB7Hardener% by weight: 50 %datasheet% by volume: 50.1 %datasheet
When you need faster drying ('excellent drying speed'): dust-free 15 min, touch 45 min.
Gloss drops to 35 ± 2 (US TDS). Pot life 4 h. EU TDS lists it on a par with LNB77. Not found at t-colormarket.ru (search 2026-10-05) — check availability.
- LNB20Hardener% by weight: 50 %datasheet% by volume: 51.1 %datasheet
Pale timbers and over white/pastel work — where non-yellowing matters.
Pot life 3 h, gloss 40 ± 3, dry 15/45 min, full 18 h (US TDS). Stocked at t-colormarket.ru ('for use with the LBA and LGA series', packs 1/2.5/12.5 l).
- LNB14 / LNB500Hardener% by weight: 50 %datasheet
When you want faster drying and a harder film.
Gloss comes out roughly 10 units lower than with LNB77 (≈30 instead of 40).
- LNB18 / LNB110 / LNB190Hardener% by weight: 50 %dealer
Listed by the dealer as allowed second components ('LNB 42, 77, 18, 110, 190, 7, 500' at 50 %).
No published data on the film with these — test first.
- LZC1051Thinner% by weight: 10–30 (typ. 20) %official% by volume: 10–30 %official
Standard thinner at 18–22 °C. 10 % for curtain/heavier build, 20 % for spraying, 30 % for small tips/airmix.
LZC1051 = 'PU extra' thinner, medium evaporation, for PU finishes at 18–22 °C, density 0.864.
- LZC1026Thinner% by weight: 10–30 (typ. 20) %datasheet% by volume: 22 %datasheet
Universal PU/NC thinner at 18–22 °C — equal alternative to LZC1051 (TDS and dealer; Technocolor lists it for sister LGA22).
Density 0.850 ± 0.01 (LZC series TDS); the US LGA20 TDS gives 0.875.
- LZC8643Thinner% by weight: 30–50 %datasheet
Above 25 °C — slow thinner, otherwise dry spray and orange peel.
30–50 % is a lot of thinner: watch for runs on verticals and allow longer before sanding.
- LZC1051 / LTC4Additive% by weight: 2–3 %datasheet
To improve flow-out.
- LZC50 / LZC13Thinner% by weight: 10–30 % w/w on Arecommended
Electrostatic spraying: LZC50 (medium-slow, resistivity > 800 MΩ·cm) or LZC13 (faster, 8–20 MΩ·cm).
Per the Milesi LZC series TDS these are the thinners for all electrostatic PU products.
| Role | Material | % by weight | % by volume | When |
|---|---|---|---|---|
| Hardener | LNB77 | 50 %official | 50–51.1 %official | Default choice. Always — weigh it, don't eyeball it.LNB77 = hardener for PU sealers and matt lacquers; solids 25 ± 1 % (t-colormarket), 23.5 ± 2 %, density 0.96 (TDS). Packs 0.5/2.5/5/12.5/25 l. Moisture-sensitive — close the can straight away. |
| Hardener | LNB42 | 50 %official | 50 %official | Official alternative to LNB77 (same hardener as the LBA42/LBA26 sealers) — handy if you keep one hardener for sealer and topcoat.LNB42 is ~26.5 % solids (Milesi LBA45 TDS). Not in the LGA2x TDS — no gloss/drying data with it; test on an offcut. |
| Hardener | LNB7 | 50 %datasheet | 50.1 %datasheet | When you need faster drying ('excellent drying speed'): dust-free 15 min, touch 45 min.Gloss drops to 35 ± 2 (US TDS). Pot life 4 h. EU TDS lists it on a par with LNB77. Not found at t-colormarket.ru (search 2026-10-05) — check availability. |
| Hardener | LNB20 | 50 %datasheet | 51.1 %datasheet | Pale timbers and over white/pastel work — where non-yellowing matters.Pot life 3 h, gloss 40 ± 3, dry 15/45 min, full 18 h (US TDS). Stocked at t-colormarket.ru ('for use with the LBA and LGA series', packs 1/2.5/12.5 l). |
| Hardener | LNB14 / LNB500 | 50 %datasheet | — | When you want faster drying and a harder film.Gloss comes out roughly 10 units lower than with LNB77 (≈30 instead of 40). |
| Hardener | LNB18 / LNB110 / LNB190 | 50 %dealer | — | Listed by the dealer as allowed second components ('LNB 42, 77, 18, 110, 190, 7, 500' at 50 %).No published data on the film with these — test first. |
| Thinner | LZC1051 | 10–30 (typ. 20) %official | 10–30 %official | Standard thinner at 18–22 °C. 10 % for curtain/heavier build, 20 % for spraying, 30 % for small tips/airmix.LZC1051 = 'PU extra' thinner, medium evaporation, for PU finishes at 18–22 °C, density 0.864. |
| Thinner | LZC1026 | 10–30 (typ. 20) %datasheet | 22 %datasheet | Universal PU/NC thinner at 18–22 °C — equal alternative to LZC1051 (TDS and dealer; Technocolor lists it for sister LGA22).Density 0.850 ± 0.01 (LZC series TDS); the US LGA20 TDS gives 0.875. |
| Thinner | LZC8643 | 30–50 %datasheet | — | Above 25 °C — slow thinner, otherwise dry spray and orange peel.30–50 % is a lot of thinner: watch for runs on verticals and allow longer before sanding. |
| Additive | LZC1051 / LTC4 | 2–3 %datasheet | — | To improve flow-out. |
| Thinner | LZC50 / LZC13 | 10–30 % w/w on Arecommended | — | Electrostatic spraying: LZC50 (medium-slow, resistivity > 800 MΩ·cm) or LZC13 (faster, 8–20 MΩ·cm).Per the Milesi LZC series TDS these are the thinners for all electrostatic PU products. |
Percentages are per 100 parts of component A.
Characteristics
- Properties (official)
- Excellent filling/coverage; Good surface hardness; Can be applied by conventional spray, airmix, vacuum coating, curtain coatingofficial
- Solids · Part A
- 42–46 % by weight, part A (44 ± 2)datasheet
- Solids · Part A (US)
- 43–47 % by weight, part A (45 ± 2)datasheet
- Solids · Parts A + B
- 38–42 % (A + hardener, 40 ± 2)datasheet
- Solids · A + B (US, LNB77)
- 36–40 % (A + 50 % LNB77, 38 ± 2)datasheet
- Solids · Ready to spray
- 32–35 % (A + 50 % LNB77 + 20 % thinner on A)recommended
- Viscosity · Part A
- 42 ± 2 sdatasheet
- Viscosity · Part A (ISO 6)
- 33 ± 3 sdatasheet
- Viscosity · Ready to spray
- 16 ± 2 sdatasheet
- Viscosity · Ready to spray (EU)
- 23 ± 2 sdatasheet
- Density · Part A
- 0.982 ± 0.03 kg/ldatasheet
- Density · Part A (US)
- 0.975 ± 0.030 kg/l (8.1 ± 0.3 lb/US gal)datasheet
- Gloss
- 40 ± 2 (EU TDS) / 40 ± 3 at 60° (US TDS, LNB77, 150 µm wet)datasheet
- Pot life · Working rule
- Plan on 3 h; mix only what you'll spray in that time.recommended
- Drying · Conditions
- EU TDS: 20 °C / 70 % RH; US TDS: 18–22 °C / 65–70 % RH
- Drying · Hard dry (h)
- 4datasheet
- Drying · Sand or stack
- 12–16 h at 20 °C (overnight)recommended
- Drying · Full cure
- 18datasheet
- Hardness
- good surface hardnessofficial
- Lightfastness
- Moderate: with the aromatic LNB77 hardener it ambers over time. Over white or pale work use LNB20 ('good yellowing resistance' per TDS).recommended
- Chemical resistance
- good chemical resistancedealer
- Thixotropy
- norecommended
- Feel
- pleasant feel, 2–5 % smoother surfacedealer
- Coverage (m²/kg)
- 6–8 m²/kg (≈125–167 g/m²)dealer
Colours
- LGA21 · clear
Application
HVLP
- Nozzle
- 1.4–1.6 (typ. 1.5) mmrecommended
- Pressure · air
- 2–2.2 bar at gun inlet, trigger pulled (≤ 0.7 bar at cap)recommended
- Spray viscosity
- 14–18 s Ford 4 (≈16–19 s DIN4)datasheet
- Consumption
- 120–140 g/m² per coatofficial
- Wet film
- 124–155 µm (4.9–6.1 wet mils at 120–150 g/m²)datasheet
- Coats
- 1–2 topcoatsrecommended
- Flash-off
- 10–15 min between crossing passesrecommended
- Recoat
- 12–16 h, after sandingrecommended
- Sanding between coats
- 320–400 gritrecommended
15–20 cm distance, 50 % overlap, fan fully open, two crossing passes for 120–140 g/m². Never sand or polish the final satin coat — the sheen goes patchy.
Conventional spray
- Nozzle
- 1.6–1.8 (typ. 1.7) mmrecommended
- Pressure · air
- 3–4 bar at gun inletrecommended
- Spray viscosity
- 14–18 s Ford 4datasheet
- Consumption
- 120–140 g/m² per coatofficial
- Wet film
- 124–155 µmdatasheet
Method named on the official page. Transfer efficiency only ~40 % (methods page) — expect more overspray.
Airmix (air-assisted airless)
- Nozzle
- 0.23–0.28 mm (tip 09–11 thou, 20–40° fan)recommended
- Pressure · fluid
- 40–70 barrecommended
- Pressure · air
- 1–2 bar (atomising air)official
- Spray viscosity
- 18–25 s Ford 4datasheet
- Consumption
- 120–150 g/m² per coatdatasheet
- Wet film
- 124–155 µmdatasheet
US TDS lists 'Airmix spray (for automatic plants)'; official page lists airmix. Better for topcoats than airless (methods page).
Electrostatic
- Nozzle
- 0.23–0.28 mm (airmix electrostatic, 09–11 thou)recommended
- Pressure · fluid
- 40–70 barrecommended
- Pressure · air
- 1–2 barofficial
- Consumption
- 120–140 g/m² applied to the partrecommended
EU TDS lists electrostatic spray. Thin with LZC50/LZC13, not LZC1051 (no resistivity spec). Chairs, legs, slatted work.
Curtain coater
- Consumption
- 120–140 g/m²official
- Spray viscosity
- 30–45 s Ford 4 (curtain viscosity)recommended
Official and TDS. TDS: not for lines that stack straight out of a drying tunnel. Flat or lightly profiled parts only.
Vacuum coater
Official page mentions vacuum coating (profiles/mouldings). No settings published — set up on the line.
Brush
Dealer says spray, brush or roller; EU TDS has a 'Brush/roller' row with no quantity. Touch-up only — satin goes on blotchy by brush.
Dipping
EU TDS lists dipping as an application method, with no quantity or viscosity. Set up on a test piece (chairs, slatted work — see the methods page).
Process and compatibility
- Substrate preparation
- Over a sealed and sanded surface (LBA PU sealer, 2–3 coats per TDS). Wood moisture 8–14 %. Sand the sealer P320–P400 and de-dust before topcoating.datasheet
- Sanding
- Between coats P320–P400 after an overnight dry. Don't sand or polish the final satin coat.recommended
- Temperature and humidity · Optimum
- 18–22 °C, 65–70 % RH, wood 8–14 %datasheet
- Temperature and humidity · Application limits
- 15–30 °Cdatasheet
- Temperature and humidity · Drying limits
- not below 15 °C; RH 50–70 %datasheet
- Temperature and humidity · Hot
- above 25 °C thin with 30–50 % LZC8643datasheet
- Don'ts
- Don't apply to bare wood — sealer first.
- Don't exceed the 3 h pot life — don't revive thickened mix with thinner.
- Don't sand or polish the final satin coat.
- Don't use LZC1051 for electrostatic.
- Don't apply or dry below 15 °C.
- Don't stack curtain-coated parts straight out of a drying tunnel.
Storage
- Packaging
- 1 l,5 ldealer
Safety: Solvent-borne 2K; the hardener contains isocyanates. Spray in an extracted booth, wear an A2P2 organic-vapour respirator (air-fed preferred), nitrile gloves and goggles. Spark-proof equipment, no smoking. See the SDS.
Sources
Value tags: “official”, “dealer”, “catalog”, “schedule” are Technocolor data; “workshop” is from our own datasheets; “recommended” is our engineering estimate (hover to see the reasoning).
- Official page: properties, spray/curtain 120–140 g/m², LNB77/LNB42 50 %, LZC1051 10–30 %
- Milesi LGA2x TDS (IVM, rev IV 2007; local copy src/pdf/tds/milesi_LGA2x_tds.pdf): solids, viscosity, density, gloss 40 ± 2, pot life 3 h, drying 15/45 min/4 h, alt hardeners LNB7/LNB14/LNB500, LZC1026, LZC8643 above 25 °C, flow additive, schedule, shelf life
- Milesi LGA20 series TDS (IVM Inc, 2015-08 rev 3; local copy src/pdf/tds/milesi_LGA2027_us.pdf): LGA21 density 0.975, solids 45 %, LNB77/LNB7/LNB20 options with ready-mix data, gloss 40 ± 3, wet film, drying, application conditions, shelf life 18 months
- Milesi LZC thinner series TDS: LZC1051/1026/8643/50/13 properties
- t-colormarket LNB77: solids 25 ± 1 %, packs, 'for PU sealers and matt lacquers'
- LGA21 not found at t-colormarket (2026-10-04)
- montana.sk dealer: description, hardener list, thinners, pot life 3 h, 6–8 m²/kg, packs
- US dealer naming the LGA2 series an aromatic 2K PU clear topcoat
- Official application-methods page (airmix air 1–2 bar, transfer efficiencies)
- LNB42 solids (via LBA45 TDS)
- t-colormarket LNB20: 'for use with LBA and LGA series', packs 1/2.5/12.5 l
Not covered by the sources
- Not stocked at t-colormarket.ru — no Technocolor dealer 'Все технические характеристики' block for LGA21
- No Technocolor-issued TDS; all numbers from Milesi/IVM TDS (EU 2007 rev IV, US 2015 rev 3) which differ slightly (pot life 3 vs 4 h, dust-free 15 vs 20 min)
- Basis of thinner % (on A or on A+B) not stated by Technocolor
- Hardness value (pendulum/pencil), elasticity, chemical-resistance test data (EN 12720) not published
- Data with LNB42 hardener (gloss, drying) not published
- Sanding/stacking time not published
- Vacuum-coating and electrostatic consumption/settings not published
- All nozzle/pressure figures are derived
- Technocolor packaging sizes