LBR40
LBR40 white 2K polyurethane primer for PU foam (PPU) and MDF
Two-component white polyurethane primer for moulded polyurethane foam (PU foam décor, mouldings) and MDF. Excellent adhesion, high build/fill, sands very well, thixotropic. Dealer adds: good hiding, high elasticity and fast hardness build; works on different kinds of PU foam with or without post-moulding treatment, and its good wetting makes it suitable for MDF under matt topcoats.
- Priming moulded PU foam parts: décor, mouldings, cornices, onlays, carved elements
- Priming MDF, including routed doors, under matt enamels
- White filling/isolating base under pigmented PU enamels and patina work
Mix calculator
Ask about LBR40
Answers are based on the LBR40 data and the products it mixes with.
Mixing matrix
- % by weight: 20 %official% by volume: 30 %official
Always; either LNB71 or LNB16405 (listed on the official page as alternatives).
Fixed ratio – weigh it, don't eyeball it. The isocyanate hardener reacts with moisture, so close the can right away. Per the dealer (Holzcom), LNB71 is a hardener for adhesion primers, solids 50 ± 1 %. t-colormarket.ru lists LNB16405 as a MILESI hardener for PU lacquers and enamels.
- LZC1051Thinner% by weight: 10–30 %official% by volume: 20–40 %official
10 % for maximum build on flat work; 20–30 % for a finer spray on carved foam décor, verticals, or a smaller nozzle.
LZC1051 is the PU thinner (official page). Add after the hardener and stir in.
- S50Thinner% by weight: 10–30 %recommended
Only if LZC1051 is not available.
Not an official pairing for LBR40. S50 is Technocolor's general thinner and Technocolor's own PU-foam finishing schedule uses it with a PU primer (PPS20040 + S50 30 %). Test on a scrap piece first.
| Role | Material | % by weight | % by volume | When |
|---|---|---|---|---|
| Hardener | LNB71 / LNB16405 | 20 %official | 30 %official | Always; either LNB71 or LNB16405 (listed on the official page as alternatives).Fixed ratio – weigh it, don't eyeball it. The isocyanate hardener reacts with moisture, so close the can right away. Per the dealer (Holzcom), LNB71 is a hardener for adhesion primers, solids 50 ± 1 %. t-colormarket.ru lists LNB16405 as a MILESI hardener for PU lacquers and enamels. |
| Thinner | LZC1051 | 10–30 %official | 20–40 %official | 10 % for maximum build on flat work; 20–30 % for a finer spray on carved foam décor, verticals, or a smaller nozzle.LZC1051 is the PU thinner (official page). Add after the hardener and stir in. |
| Thinner | S50 | 10–30 %recommended | — | Only if LZC1051 is not available.Not an official pairing for LBR40. S50 is Technocolor's general thinner and Technocolor's own PU-foam finishing schedule uses it with a PU primer (PPS20040 + S50 30 %). Test on a scrap piece first. |
Percentages are per 100 parts of component A.
Characteristics
- Solids
- 70 ± 1 %dealer
- Viscosity
- 44 ± 2 sdealer
- Density
- 1.4–1.5 g/cm³recommended
- Gloss
- n/arecommended
- Pot life
- 2 hdealer
- Drying · Dust-free
- 20–30 minrecommended
- Drying · Before sanding
- 4–8 hrecommended
- Drying · Fully dry
- 8 hdealer
- Drying · Conditions
- 20 °C, 60–65 % RH
- Hardness
- fast hardness developmentdealer
- Elasticity
- high elasticitydealer
- Thixotropy
- yesofficial
- Adhesion
- excellent (official: 'Отличная адгезия')official
- Filling
- high build ('высокая наполняющая способность')official
- Sandability
- sands very well ('отлично шлифуется')official
- Hiding
- good hiding/coveragedealer
- Lightfastness
- not publishedrecommended
- Interior or exterior
- interior onlydealer
Colours
- LBR40 · white
Application
HVLP
- Nozzle
- 1.8–2 mmrecommended
- Pressure · air
- 2–2.5 barrecommended
- Spray viscosity
- 22–30 s DIN4 / VZ-4 (indicative only)recommended
- Consumption
- 120 g/m²official
- Wet film
- 85–100 µmrecommended
- Coats
- 1–2recommended
- Flash-off
- 10–20 minrecommended
- Sanding between coats
- P240–P320 on flat areas, grey/red Scotch-Brite mats on carved foamrecommended
1.8–2.0 mm gun, 2.0–2.5 bar at the inlet with the trigger pulled, 15–20 cm distance, 50 % overlap. On carved foam décor, mist all the recesses first, then lay a full coat.
Conventional spray
- Nozzle
- 1.8–2.2 mmrecommended
- Pressure · air
- 3–4 barrecommended
- Consumption
- 120 g/m²official
Conventional air spray per the official methods page – transfer efficiency up to 40 %, so allow for overspray. official
Airmix (air-assisted airless)
- Nozzle
- 0.28–0.33 mmrecommended
- Pressure · fluid
- 40–80 barrecommended
- Pressure · air
- 1–2 barofficial
- Consumption
- 120 g/m²official
Airless
- Nozzle
- 0.33–0.43 mmrecommended
- Pressure · fluid
- 120–180 barrecommended
Large flat MDF parts only; for carved foam décor HVLP/airmix gives better control.
Process and compatibility
- Substrate preparation
- PU foam: part fully cured after moulding; remove mould-release (solvent wipe), scuff with an abrasive pad, de-dust. Dealer says it also works on foam without post-moulding treatment. MDF: sand P180–P240, especially edges, de-dust.recommended
- Goes over
- PU foam (bare) / MDF (bare)
- Goes under
- PU pigmented enamels (e.g. PPL20 with C20/C61 per Technocolor's PPU schedule) / patina CQS / PU clear lacquers (e.g. PTL500)
- Sanding
- After 4–6 h (or overnight for thick coats): P240–P320 on flats, abrasive mats on profilesrecommended
- Temperature and humidity
- 18–25 °C, RH ≤ 75 %recommended
- Don'ts
- Don't use the mix past its 2 h pot life – don't revive a thickened mix with thinner
- Don't spray onto cold or damp parts
- Don't change the hardener ratio
- Don't pile too much on foam in one pass
Storage
- Shelf life
- not publishedrecommended
- Storage temperature
- +5…+30 °C, tightly closed, hardener protected from moisturerecommended
- Packaging
- sold per kg (t-colormarket.ru price unit руб./кг); Holzcom lists a 25 L can (art. LBR40/25)dealer
Safety: Flammable. Solvent-borne; hardener contains isocyanates – spray in a booth with extraction, wear a charcoal respirator (A2/P2), gloves and eye protection.
Sources
Value tags: “official”, “dealer”, “catalog”, “schedule” are Technocolor data; “workshop” is from our own datasheets; “recommended” comes from industry best practices (hover to see the reasoning).
- official page: properties, method 120 g/m², hardener LNB71/LNB16405 20 % wt / 30 % vol, thinner LZC1051 10–30 % wt / 20–40 % vol
- dealer page (now 404, re-checked 2026-10-05). From a search snippet: pot life 2 h at 20 °C and the description (hiding, elasticity, hardness build, MDF under matt)
- Holzcom/timb.ru dealer page (live 2026-10-05): viscosity 44±2 s VZ-6, solids 70±1 %, full dry 8 h at 20 °C, 120 g/m², interior, pigmented, PPU system, 25 L can, same hardener/thinner table
- dealer search card: name, MILESI, sold per kg, not buyable
- LNB16405 hardener page (MILESI, hardener for PU lacquers/enamels)
- LZC1051 PU thinner official page
- official PPU finishing schedule (context, sanding after 4 h, topcoat sequence)
- official application methods page
- characteristics vocabulary (thixotropic, adhesion)
- LBR90 official page (different hardener LNB77 40/50 %, for the sibling note)
Not covered by the sources
- density of part A (derived from weight/volume ratio only)
- shelf life
- no MILESI/Technocolor TDS PDF for LBR40 found (only LBR402 US TDS exists, a different product)
- nozzle/pressure data – all derived
- lightfastness / chemical resistance not published
- thinner discrepancy: 10–30 % wt vs 20–40 % vol implies inconsistent thinner/part A density ratio (2.0 at low end vs 1.33 at high end)
- dust-free and sanding times are only derived; full dry of 8 h at 20 °C is from a dealer (Holzcom/timb.ru)
- pot life of 2 h comes only from a cached snippet of the 404 t-colormarket.ru page. It is unverified live, and timb.ru doesn't list it
- t-colormarket.ru LBR40 product page is 404 (redirects to /catalog/poliuretanovye_materialy/grunty_2/lbr40/ → 404); the full technical table there was not available