LQA836
LQA836 PU isolating sealer (isolator / barrier coat)
Two-pack polyurethane isolator by MILESI. High isolating power, deep penetration into the wood, excellent clarity. Locks in the oils and extractives of exotic species and MDF so they don't upset cure and adhesion of the polyester or PU coats on top. Mixed 1:1 with LNB837 hardener and sprayed as a light veil, no sanding.
- Isolator for oily exotic woods: rosewood, teak, etimoe, padauk, zebrano etc.
- Sealing MDF before polyester primers (LRA series, LRR16)
- First coat (isolator) of the 'Mosaic' special-effect system under LRR16 primer
- Interior use only
Mix calculator
Ask about LQA836
Answers are based on the LQA836 data and the products it mixes with.
Mixing matrix
- LNB837Hardener% by weight: 100 %official% by volume: 100 %official
Always — LNB837 is mandatory
1:1. Foussier: 'catalyses 100 % with LNB837 (essential)'. Don't swap in another PU hardener.
- LZC1051Thinner% by weight: 10 %official% by volume: 10 %official
Standard reducer
It's already very thin — no need to go past 10 %.
- LZC1026Thinner% by weight: not stated %dealer
Alternative MILESI reducer (Ukrainian dealer)
Dose not published — treat like LZC1051, max 10 %.
| Role | Material | % by weight | % by volume | When |
|---|---|---|---|---|
| Hardener | LNB837 | 100 %official | 100 %official | Always — LNB837 is mandatory1:1. Foussier: 'catalyses 100 % with LNB837 (essential)'. Don't swap in another PU hardener. |
| Thinner | LZC1051 | 10 %official | 10 %official | Standard reducerIt's already very thin — no need to go past 10 %. |
| Thinner | LZC1026 | not stated %dealer | — | Alternative MILESI reducer (Ukrainian dealer)Dose not published — treat like LZC1051, max 10 %. |
Percentages are per 100 parts of component A.
Characteristics
- Solids
- 24 ± 1 %, 24 ± 1 %, 15.7 ± 2 %
- Viscosity
- 10 ± 2 s, 10 ± 2 s, 26 ± 2 s
- Density
- 0.909 ± 0.030 kg/ldealer
- Pot life
- 4 h, 18 h
- Drying · Full cure
- 4 hdealer
- Drying · Overcoat with LRA, no sanding
- [object Object],[object Object],[object Object]dealer
- Drying · Conditions
- 20 °C
- Thixotropy
- norecommended
- Interior or exterior
- interior onlydealer
Application
Conventional spray
- Nozzle
- 1.3–1.5 mmrecommended
- Pressure · air
- 2.5–3 barrecommended
- Spray viscosity
- 10–14 s DIN4, 20 °Crecommended
- Consumption
- 70–100 g/m²official
- Wet film
- 75–110 µmrecommended
- Coats
- light veil coat, normally 1dealer
- Recoat
- LRA polyester primer without sanding after 30 min at 25–28 °C, 1 h at 21–25 °C, 1.5 h at 17–20 °C; miss the window and you must sand the isolatordealer
- Sanding between coats
- don't sand the isolator if you overcoat inside the windowdealer
The job is to soak in and seal, not to build. One wet but thin pass; on MDF edges and end grain a second pass straight away is fine.
HVLP
- Nozzle
- 1.3–1.4 mmrecommended
- Pressure · air
- 1.8–2 barrecommended
- Spray viscosity
- 10–14 s DIN4, 20 °Crecommended
- Consumption
- 70–100 g/m²official
- Coats
- light veil coat, normally 1dealer
15–20 cm gun distance, 50 % overlap. Don't flood it — runs in the isolator telegraph through the polyester.
Airmix (air-assisted airless)
- Nozzle
- 0.18–0.23 mm (07–09 thou), fan 20–40°recommended
- Pressure · fluid
- 20–40 barrecommended
- Pressure · air
- 1–1.5 barrecommended
- Consumption
- 70–100 g/m²official
Production lines only; for one-offs HVLP is easier.
Brush
- Consumption
- 70–100 g/m²official
- Coats
- 1recommended
Brush thin and lay it off; brush is for small parts and edges.
Process and compatibility
- Substrate preparation
- sanded, dust-free wood or MDF; wipe oily exotics with solvent before isolatingrecommended
- Goes over
- bare wood / MDF
- Goes under
- [object Object] / [object Object] / [object Object]
- Sanding
- no sanding inside the overcoat window; after it, sand before polyesterdealer
- Temperature and humidity
- 17–28 °C (overcoat intervals are given for this range only)dealer
- Don'ts
- Don't lay it on thick — it's an isolator, not a primer
- Don't overcoat with polyester past the window without sanding
- Don't use any hardener other than LNB837
- Not for exterior work
Storage
- Packaging
- 5 л, 25 лdealer
- Availability
- t-colormarket product page returns 404 (2026-10-04); Foussier marks it «Produit arrêté» (discontinued)dealer
Safety: Solvent-borne 2K PU; hardener contains isocyanates. Spray in a booth, wear an A2P2 (or better) organic-vapour respirator and nitrile gloves. Flammable. See the MILESI SDS (available via Foussier) for details.
Used in finishing systems
Mixed into
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: properties, spray/brush 70–100 g/m², LNB837 100/100 %, LZC1051 10/10 %
- dealer: solids 24 ± 1 %, viscosity 10 ± 2 s CF-4, pot life 4 h, uses (exotic woods, MDF), LRA overcoat intervals
- dealer search hit 'LQA836 Грунт полиуретановый изолирующий' — product page now 404
- dealer: same characteristics, '4 h full drying', interior only, 5/25 L packs, mix table
- dealer (FR): veil coat, no sanding, LNB837 100 % mandatory, discontinued
- dealer (UK, search extract only): density 0.909, dry extract 15.7 %, ISO 3 cup 26 s, 60–80 g/m²
- dealer (UA, search extract only): LZC1026/LZC1051 thinners, 18 h pot life
Not covered by the sources
- No official/Technocolor TDS found; MILESI technical sheet (Foussier FT-0000000949) is not downloadable
- Pot life conflict: 4 h (t-colormarket LNB837 page) vs 18 h (UA dealer snippet); timb.ru calls the 4 h 'full drying time'
- Solids conflict: 24 ± 1 % (RU dealers) vs 15.7 ± 2 % (UK dealer snippet)
- Dust-free / touch-dry time not published
- Shelf life and storage temperature not published
- LZC1026 dose not published
- Whether LZC1051 10 % is on part A or on the A+B mix not stated
- Not used in any official t-color.ru finishing schedule (information/technology)
- No sourced nozzle/pressure data — all spray settings derived