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PolyurethanePrimer

LBR15

LBR15 white polyurethane primer (2K)

Two-pack white polyurethane primer. Per the maker: excellent hiding, thixotropic, strong resistance to shrink-back (doesn't sink after sanding), and holds well on sharp edges. Spray-applied at 130–150 g/m² per coat; cured with LNB613 (40 % by weight) or LNB29 (20 % by weight), thinned with LZC1051 or S50.

  • white primer under pigmented PU enamels (also under gloss, thanks to low shrink-back)
  • routed MDF doors and parts with sharp edges
  • solid wood and veneer under opaque finishes

Mix calculator

g
Hardener40.0 %

LNB613: 40.0 % — fixed by the datasheet

When: primary option

Thinner25.0 %

When: Milesi PU thinner, medium evaporation

Ratio 100 : 40.0 : 25.0

ComponentWeigh out
LBR15part A303 g
LNB613Hardener121 g
LZC1051Thinner75.8 g
Total500 g

Covers roughly 3.57 m² at 140 g/m².

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Answers are based on the LBR15 data and the products it mixes with.

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Mixing matrix

  • LNB613Hardener
    % by weight: 40 %official% by volume: 55 %official

    primary option

    Fixed ratio — weigh it. With LNB613 the sister LBR102 gets 4 h pot life and better flexibility (Milesi TDS).

  • LNB29Hardener
    % by weight: 20 %official% by volume: 27 %official

    alternative hardener

    LNB29 is a more concentrated hardener (half the dose). No separate data on it at t-color.ru or the dealer.

  • LZC1051Thinner
    % by weight: 20–30 %official% by volume: 35–45 %official

    Milesi PU thinner, medium evaporation

    The official 35–45 % by volume is one line shared by both thinners.

  • S50Thinner
    % by weight: 20–30 (typ. 25) %official% by volume: 35–45 %official

    universal thinner, default; vertical surfaces

    S50 is normal evaporation (workshop notes). Above ~25 °C or on big panels S80 is an option — not officially listed for LBR15.

  • S80Thinner
    % by weight: 20–30 %recommended

    heat above ~25 °C, large flat panels

    Not an official pairing. More dust pick-up and sag risk.

Percentages are per 100 parts of component A.

Characteristics

Thixotropy
yesofficial
Hiding power
excellent hiding / opacityofficial
Shrink resistance
resists shrink-back / sinkingofficial
Edge build
stays on sharp edges (good edge build)official
Drying · Conditions
18–22 °C, 65–70 % RH (conditions of the LBR102 TDS analogue)
Drying · Recoat
between primer coats ≥2 h, ≤3 h without sanding; topcoat after 20–24 hrecommended

Colours

  • LBR15 · white

Application

HVLP

Consumption
130–150 g/m²official
Wet film
110–130 µmrecommended
Nozzle
1.8–2 mmrecommended
Pressure · air
2–2.5 barrecommended
Gun distance
15–20 cmrecommended
Coats
1–2 coatsrecommended
Sanding between coats
P240–P320 once fully dry (best next day); final pass before enamel P320–P400recommended

Thixotropic — stir until uniform before adding hardener; fan fully open, 50–75 % overlap.

Conventional spray

Consumption
130–150 g/m²official
Nozzle
1.8–2.2 mmrecommended
Pressure · air
3–4 barrecommended

Transfer efficiency up to 40 % (methods page) — real usage is higher.

Airmix (air-assisted airless)

Consumption
130–150 g/m²official
Nozzle
0.28–0.33 mmrecommended
Pressure · fluid
40–80 barrecommended
Pressure · air
1–2 barofficial

Best compromise for doors: less overspray, good edge build.

Airless

Consumption
130–150 g/m²official
Nozzle
0.33–0.43 mmrecommended
Pressure · fluid
120–180 barrecommended

Big flat parts only; easy to over-build in routed profiles.

Process and compatibility

Substrate preparation
Sand MDF/solid wood P150–P180, de-dust; MDF edges to P220 plus an extra primer coat. Wood moisture 8–14 %.recommended
Goes under
PPL10 / PPL20 / PPL200 / PPL500 / PPL50
Sanding
Final sanding before enamel no sooner than next day so the primer doesn't sink; P320–P400.recommended
Temperature and humidity
apply 15–30 °C (optimum 18–22 °C), RH 65–70 % optimum, 50–70 % during drying; do not dry below 15 °C; substrate moisture 8–14 %recommended
Don'ts
  • don't eyeball the hardener — LNB613 40 %, LNB29 20 % by weight
  • don't swap the two hardener doses
  • don't exceed 150 g/m² per coat
  • don't do the final sand before the next day
  • don't use mix past its pot life

Storage

Packaging
not published; dealer prices it per kg (руб./кг), product page 404dealer
Conditions
indoors 0–35 °C, ventilated, out of sun; shelf life ≈18 months from productionrecommended

Safety: Solvent-borne 2K PU with isocyanate hardener: extracted spray booth, spark-proof kit, air-fed mask or A2P3 filters, nitrile gloves, goggles.

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).

Not covered by the sources
  • Solids part A (only an estimate given)
  • Viscosity part A
  • Density (only back-calculated)
  • Drying: dust-free / touch / sand / full (only LBR102 analogue)
  • Hardener LNB29: no data page anywhere
  • Dealer product page (t-colormarket.ru returns 404; search card only)
  • No Technocolor/Milesi TDS for LBR15 found (local 'milesi_lbr15_lbr90_tds_us.pdf' actually covers LBR102, not LBR15)
  • Not used in any official finishing schedule (information/technology)
  • Not in catalog transcripts
  • Web search budget exhausted — other dealers not fully checked (woodonline: no result)
  • Pot life with LNB613/LNB29 (only LBR102 analogue: 4 h with LNB613)
  • Packaging (only 'per kg' pricing seen) and LBR15-specific shelf life/storage
  • Official thinner volume range 35–45 % inconsistent with 20–30 % w (see discrepancies)
  • Web search budget exhausted in this session; lakokraska31/ndom31 search URLs 404, woodonline no hit