LBR43
LBR43 PU primer, walnut, for polyurethane foam (PU foam mouldings)
Two-component polyurethane primer in a walnut colour for polyurethane-foam (PU foam) items: mouldings, cornices, frames, faux-wood decorative pieces. Excellent adhesion to PU foam, high build, sands very easily, thixotropic — holds on verticals and carved relief without sagging. The coloured primer gives an even wood-tone base for patina, tinted lacquer or enamel.
- priming PU-foam items (mouldings, cornices, picture frames, imitation wood carving)
- walnut-tone base under patina and clear/tinted lacquers
- interior use only
Mix calculator
Ask about LBR43
Answers are based on the LBR43 data and the products it mixes with.
Mixing matrix
- LNB71Hardener% by weight: 20 %official% by volume: 30 %official
Primary hardener for the adhesion PU primers on PU foam.
LNB71: 50 ± 1 % solids; dealer describes it as the second component for adhesion PU primers for PU foam. Fixed ratio — don't overdose it to speed things up.
- LNB16405Hardener% by weight: 20 %official% by volume: 30 %official
Alternative to LNB71 (the official card lists them as "LNB71/LNB16405"). Milesi's general hardener for PU lacquers and enamels.
Use one hardener per batch, don't blend the two.
- LZC1051Thinner% by weight: 10–30 (typ. 20) %official% by volume: 20–40 %official
10 % for airless/airmix and max build; 20 % standard for HVLP/conventional; up to 30 % for fine carving, hot shop or a small nozzle.
LZC1051 is a general-purpose PU thinner with medium evaporation (dealer data). Thinner does not change cure time.
| Role | Material | % by weight | % by volume | When |
|---|---|---|---|---|
| Hardener | LNB71 | 20 %official | 30 %official | Primary hardener for the adhesion PU primers on PU foam.LNB71: 50 ± 1 % solids; dealer describes it as the second component for adhesion PU primers for PU foam. Fixed ratio — don't overdose it to speed things up. |
| Hardener | LNB16405 | 20 %official | 30 %official | Alternative to LNB71 (the official card lists them as "LNB71/LNB16405"). Milesi's general hardener for PU lacquers and enamels.Use one hardener per batch, don't blend the two. |
| Thinner | LZC1051 | 10–30 (typ. 20) %official | 20–40 %official | 10 % for airless/airmix and max build; 20 % standard for HVLP/conventional; up to 30 % for fine carving, hot shop or a small nozzle.LZC1051 is a general-purpose PU thinner with medium evaporation (dealer data). Thinner does not change cure time. |
Percentages are per 100 parts of component A.
Characteristics
- Properties (official)
- Excellent adhesion, high filling/build, sands very well, thixotropic.official
- Thixotropy
- yesofficial
- Solids
- 68–70 %recommended
- Viscosity
- 44 ± 2 srecommended
- Density
- ≈1.3–1.6 kg/l (part A) kg/lrecommended
- Gloss
- matt primerrecommended
- Pot life
- 2–4 hrecommended
- Drying · Dust-free
- 20–40 minrecommended
- Drying · Touch-dry
- 40–90 minrecommended
- Drying · Sand or stack
- 4–8 hrecommended
- Drying · Full cure
- 8–12 hrecommended
- Drying · Conditions
- 20 °C, ~60 % RH (assumed standard)
Colours
- LBR43 · walnut
Application
HVLP
- Nozzle
- 1.8–2 mmrecommended
- Pressure · fluid
- gravity cup, or 0.8–1.5 bar pot pressure barrecommended
- Pressure · air
- 2–2.5 barrecommended
- Spray viscosity
- ≈20–25 s VZ-6 (6 mm cup) after ~20 % LZC1051 — still too thick for a meaningful DIN4 reading srecommended
- Consumption
- 120 g/m²official
- Wet film
- 80–100 µmrecommended
- Coats
- 1–2 coatsrecommended
- Flash-off
- 10–15 minrecommended
- Recoat
- topcoat after sanding, once sandable (4–8 h, or overnight)recommended
- Sanding between coats
- P240–P320 or fine sanding pads/mats on reliefrecommended
15–20 cm distance, 50 % overlap, fan fully open. On carving hit the recesses first, then the general pass.
Conventional spray
- Nozzle
- 1.8–2.2 mmrecommended
- Pressure · air
- 3–4 barrecommended
- Consumption
- 120 g/m²official
- Transfer efficiency
- до 40 %official
Transfer efficiency up to 40 % per the methods page — more waste and overspray; otherwise as HVLP.
Airmix (air-assisted airless)
- Nozzle
- 0.28–0.33 mmrecommended
- Pressure · fluid
- 60–100 barrecommended
- Pressure · air
- 1–2 barofficial
- Consumption
- 120 g/m²official
Use a 100-mesh gun filter — it's a pigmented primer.
Airless
- Nozzle
- 0.33–0.38 mmrecommended
- Pressure · fluid
- 120–180 barrecommended
- Consumption
- 120 g/m²official
Large pieces only; use HVLP on small mouldings.
Brush
Officially spray only. Brush only for small touch-ups.
Process and compatibility
- Substrate preparation
- Thoroughly degrease the PU foam (wash off mould-release agent), dry, de-dust. Fill seams/defects with PU filler.recommended
- Goes over
- PU foam (ППУ) — bare, degreased
- Goes under
- PU pigmented enamels / RAL-NCS enamels (e.g. PPL20) / CQS patinas / PU clear lacquers (e.g. LGA21, LGA22, LGA210, PTL500) / acrylic clear lacquer ATL500
- Sanding
- P240–P320 or fine sanding mats on relief; scuff only — don't cut through on edges of the foamrecommended
- Temperature and humidity
- 18–25 °Crecommended
- Don'ts
- don't use outdoors (interior product)
- don't overdose the hardener
- don't spray onto un-degreased PU foam — it will peel
- don't sand before it's dry — it clogs the paper
Storage
Safety: 2K polyurethane with isocyanate hardener and solvents: flammable; spray in a booth with an organic-vapour respirator (A2P2) and nitrile gloves; don't seal leftover mixed material airtight.
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 card: properties, spray 120 g/m², LNB71/LNB16405 20 % wt / 30 % vol, LZC1051 10–30 % wt / 20–40 % vol
- dealer search — no LBR43 product listed
- sister LBR45: 68 ± 1 % solids, 44 ± 2 s VZ-6, 12 h full dry, interior, mix table
- sister LBR40: 70 ± 1 % solids, 44 ± 2 s VZ-6, 8 h full dry, interior, mix table
- LNB71: 50 ± 1 % solids, hardener for adhesion PU primers for PU foam
- LNB16405: Milesi PU hardener for lacquers and enamels
- LZC1051: universal medium-evaporation PU thinner
- application methods (pneumatic ≤40 % TE, airless ≤200 bar, airmix ≤20 bar + 1–2 bar air)
- official PPU/PU finishing schedule (PPS20040 based)
- Milesi PU-foam coatings — marketing only, no data
- PPS40043 (Technocolor walnut PU-foam primer): 76 ± 1 % solids, 25 ± 2 s CF-8, pot life 3 h, touch 30 min, full 6 h, S50 20–30 % wt / 40–50 % vol, C20040/C20041
- LBR90: different formulation (LNB77 40/50 %, LZC1026/LZC1051, 130–150 g/m²) — not a colour variant of LBR43
Not covered by the sources
- LBR43 has no product page at t-colormarket.ru (search returns nothing; its search index still lists an LBR40 link that 404s) and none at timb.ru; solids, viscosity and full-dry are carried over from sisters LBR40/LBR45 as derived values
- pot life — not published anywhere found
- dust-free / touch / sanding times — not published
- gloss of the primer film — not published
- density — only inferred from weight/volume ratios
- hardness, elasticity, lightfastness, chemical resistance — not published
- shelf life, storage temperature, packaging sizes for LBR43 (sisters sold in 25 l at timb.ru)
- no Milesi TDS/SDS PDF for LBR43 / LNB71 / LZC1051 found (prowoodfinishes Milesi PDFs 403; milesi.com foam page has no data)
- difference in use between LNB71 and LNB16405 not stated by Technocolor
- not used in any official Technocolor finishing schedule