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PolyurethaneSealer

LBA528

LBA528 High-solids thixotropic clear PU sealer (Milesi 'Polyurethane electrostatic sealer')

Two-pack clear polyurethane sanding sealer, high solids (~50 %). Thixotropic, so it stands up on verticals without runs, fills grain hard and hand-sands easily. Made for conventional and electrostatic spraying. Goes on bare or stained wood under PU topcoats such as the thixotropic LGA53x series.

  • Case goods and assembled furniture, chairs, turned parts (beech)
  • Solid-wood items
  • Fronts, frames and profiles
  • Softwoods (pine, alder) where heavy grain fill is wanted
  • Electrostatic finishing of chairs and open-frame work

Mix calculator

g
Hardener50.0 %

LNB6 / LNB77: 50.0 % — fixed by the datasheet

When: Standard option per the Technocolor page.

Thinner20.0 %

When: Standard range per the Technocolor page.

Ratio 100 : 50.0 : 20.0

ComponentWeigh out
LBA528part A294 g
LNB6 / LNB77Hardener147 g
LZC1026 / LZC1051 / LTC40Thinner58.8 g
Total500 g

Covers roughly 3.33 m² at 150 g/m².

Pot life of the mix: 2 h.

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Mixing matrix

  • LNB6 / LNB77Hardener
    % by weight: 50 %official% by volume: 50 %official

    Standard option per the Technocolor page.

    2:1 mix (sealer : hardener). LNB77 is the 'hardener for PU primers and matt lacquers', solids 25 ± 1 % (t-colormarket). LNB6 = Milesi LNB06 (BG schedule: LNB05/LNB06 are the higher-solids versions).

  • LNB06Hardener
    % by weight: 50 %datasheet

    Per Milesi TDS.

    LNB06 is Technocolor's LNB6. Pot life 2 h. The TDS weight/volume columns are not clearly filled; 50 % sits on the catalysis line.

  • LNB05 / LNB06Hardener
    % by volume: 50 %dealer

    Electrostatic schedule (Milesi's Bulgarian distributor).

    LNB05/LNB06 are the higher-solids versions.

  • LNB42 / LNB500Hardener
    % by weight: 50 %dealer

    Alternative listed by a Slovak Milesi dealer.

    Not on the Technocolor page — use only if LNB6/LNB77 are unavailable. Dealer quotes 3 h pot life with these.

  • LZC1026 / LZC1051 / LTC40Thinner
    % by weight: 10–30 %official% by volume: 10–30 %official

    Standard range per the Technocolor page.

    LZC1026 is the universal medium thinner (18–22 °C). LZC1051 is a medium PU 'extra' thinner. LTC40 is the TDS alternative.

  • LZC1026 / LTC40Thinner
    % by weight: 15–25 %datasheet

    Conventional spray (TDS).

    Aim for 20 s Ford 4.

  • LZC1026 / LTC40Thinner
    % by weight: 20–40 %datasheet

    Electrostatic spray (TDS).

    For electrostatics a dedicated thinner (LZC13) is preferred, see below.

  • LZC13Thinner
    % by volume: 20–25 %dealer

    Electrostatic spraying.

    LZC13 is Milesi's electrostatic thinner, resistivity 8–20 MΩ·cm, faster than LZC50. BG example: 1 l LBA528 + 0.5 l LNB06 + 0.3 l LZC13 = 30 % of part A or 20 % of the A+B mix. The Slovak dealer also names LZC13 for electrostatic work (within its 10–30 %).

Percentages are per 100 parts of component A.

Characteristics

Solids
50 ± 2 % by weight, part Adatasheet
Viscosity
24 ± 2 sdatasheet
Ready-to-use viscosity
20 ± 2 sdatasheet
Density
0.990 ± 0.020 g/mldatasheet
Gloss
n/adatasheet
Pot life
2 hdatasheet
Drying · Dust-free
15 mindatasheet
Drying · Touch-dry
45 mindatasheet
Drying · Sand or stack
2 hdatasheet
Drying · Hard dry (h)
5 hdatasheet
Drying · Recoat without sanding (h)
1–3 hdatasheet
Drying · Topcoat after (h)
4 hdatasheet
Drying · Full cure
>= 24 h (through-cure several days) hrecommended
Drying · Conditions
20 °C, 70 % RH (TDS)
Hardness
hard, sandable sealer coatrecommended
Thixotropy
yesofficial
Sandability
easy manual sandingofficial
Filling
maximum filling powerdatasheet
Yellowing
good resistance to yellowingdealer

Colours

  • LBA528 · clear

Application

HVLP

Nozzle
1.7–1.9 (typ. 1.8) mmrecommended
Pressure · air · Inlet pressure
2–2.5 barrecommended
Pressure · air · Cap
≤ 0.7 barrecommended
Spray viscosity
18–22 s DIN4 (TDS: 20 s Ford 4)recommended
Consumption
150 g/m²official
Wet film
140–160 µmrecommended
Coats
1–2 coatsdatasheet
Flash-off
15–20 minrecommended
Recoat · Without sanding
1–3 hdatasheet
Recoat · Topcoat after
4 hdatasheet
Sanding between coats
P280–P320 after 2–3 hdealer
Gun distance
15–20 cmrecommended

Thixotropic: stir part A well before mixing. Holds 150 g/m² on verticals without sagging. Second coat without sanding after 1–3 h (TDS). If the paper clogs, give it more time.

Conventional spray

Nozzle
1.6–1.8 (typ. 1.7) mmrecommended
Pressure · air
3–4 barrecommended
Spray viscosity
20 ± 2 s Ford 4datasheet
Consumption
150 g/m²datasheet
Coats
1–2 coatsdatasheet

Thin 15–25 % (TDS). Low transfer efficiency (~40 %, methods page).

Electrostatic

Nozzle
0.23–0.28 mmrecommended
Pressure · fluid
20–60 barrecommended
Pressure · air
1–2 barofficial
Voltage (kV)
60–80 kVrecommended
Spray viscosity
18–20 s DIN4 with LZC13recommended
Consumption
150 g/m²official
Coats
1–2 coatsdatasheet

Ground the part; wood needs enough moisture (≈8–10 %+) to conduct for electrostatics. Thin with LZC13 (BG: 20–25 %; example 0.3 l per 1 l sealer + 0.5 l hardener).

Airmix (air-assisted airless)

Nozzle
0.23–0.33 mmrecommended
Pressure · fluid
20–60 barrecommended
Pressure · air
1–2 barofficial
Spray viscosity
20–25 s DIN4recommended

Airless

Nozzle
0.28–0.33 mmrecommended
Pressure · fluid
100–150 barrecommended

Not in the TDS; the Italian dealer (Spanò) lists airmix and airless. Airless gives a coarser surface on furniture — airmix is better.

Process and compatibility

Substrate preparation
Bare wood sanded P150–P180 (softwood P180), dust-free, moisture 8–12 %; stain (water-based) fully dry before sealingrecommended
Sanding
P280–P320dealer
Temperature and humidity
20 °C, 70 % RH reference; store at 18–25 °Cdatasheet
Don'ts
  • Don't use past pot life (2 h) — never thin a thickened mix to stretch it
  • Don't topcoat more than ~4 h after sanding without re-sanding (BG schedule)
  • Keep hardener tins closed — it is moisture-sensitive
  • Don't spray below 15 °C

Storage

Shelf life
8 months from deliverydatasheet
Storage temperature
18–25 °Cdatasheet
Packaging
5 l (montana.sk, Spanò),25 l on request (Spanò)dealer

Safety: Solvent-borne; hardener contains isocyanates. Spray in a ventilated booth with an A2 organic-vapour respirator (air-fed preferred), nitrile gloves and eye protection. Flammable.

Mixed into

LNB5 / LNB500 / LNB6 / LNB77 / LTC40

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
  • t-colormarket.ru product page for LBA528 returns 404 (search finds the name only) — no dealer 'Все технические характеристики' block
  • No Technocolor catalog transcript or official finishing schedule mentions LBA528
  • Mixed (A+B) solids and dry film per coat not published
  • Hardness, elasticity, chemical resistance, lightfastness values not published
  • LTC40 not found at t-colormarket.ru or in the Milesi LZC sheet; LNB6 not found at the dealer (only LNB613/LNB6A37)
  • Exact Ford-4 vs DIN4 conversion assumed close (~±2 s)
  • Dealer-reported 41 % solids figure seen in a search summary could not be traced to a page; ignored in favour of TDS 50 %
  • No SDS retrieved
  • t-colormarket.ru has no detail page for LBA528 (search lists name only, 'Подробнее' link dead) — no dealer pot life/drying/solids block
  • TDS mix-ratio columns (weight vs volume) are not clearly filled; whether 15–25 % / 20–40 % dilution is by weight or volume is unstated