LRA923
LRA923 high-clarity polyester (PE) sealer/primer
Clear unsaturated-polyester (PE) sealer with very high clarity. Chemically cured with the LOB810 peroxide hardener plus LOB828 or LOB6AA1 accelerator. Per the manufacturer it is more transparent and more flexible than the other PE primers in the range. Builds a thick, practically non-shrinking film for clear closed-pore and high-gloss finishes.
- clear closed-pore finishes on solid wood and veneer where the colour of the wood or stain must stay clean
- build coat under high-gloss PU or PE topcoats (tables, doors, carcasses)
- a clear PE sealer where you need more flex than standard PE primers give (solid wood, veneer on moving substrates)
Mix calculator
Ask about LRA923
Answers are based on the LRA923 data and the products it mixes with.
Mixing matrix
- LOB828Accelerator% by weight: 2 %official% by volume: 2 %official
Standard accelerator. Add it first and stir it fully into the base before the hardener goes in.
Never let accelerator and hardener touch each other directly — always go through the base (peroxide + cobalt salt reacts violently, can ignite).
- LOB6AA1Accelerator% by weight: 2 %official% by volume: 2 %official
Alternative to LOB828 (listed as LOB828/LOB6AA1). Use one or the other, not both.
Technocolor does not say how LOB6AA1 differs from LOB828.
- LOB810Hardener% by weight: 2 %official% by volume: 2 %official
Standard peroxide hardener for PE (dealer: 'hardener for polyester materials', MILESI). Goes in after the accelerator.
In PE the hardener is an initiator, not a stoichiometric partner: don't add extra 'for speed' — you get a brittle, over-heated film and a shorter pot life.
- LOB5Hardener% by weight: 2 %recommended
Only if you need longer pot life, a cool shop or a heavy coat. Not officially listed for LRA923 — run a test panel first.
- S10Thinner% by weight: 10 %official% by volume: 10 %official
Fast thinner with strong solvency — the default for PE primers; also used to flush the gun.
- S11Thinner% by weight: 10 %official% by volume: 10 %official
Medium evaporation — for hot shops (above ~25 °C) and big flat panels so the coat flows out and doesn't solvent-pop.
| Role | Material | % by weight | % by volume | When |
|---|---|---|---|---|
| Accelerator | LOB828 | 2 %official | 2 %official | Standard accelerator. Add it first and stir it fully into the base before the hardener goes in.Never let accelerator and hardener touch each other directly — always go through the base (peroxide + cobalt salt reacts violently, can ignite). |
| Accelerator | LOB6AA1 | 2 %official | 2 %official | Alternative to LOB828 (listed as LOB828/LOB6AA1). Use one or the other, not both.Technocolor does not say how LOB6AA1 differs from LOB828. |
| Hardener | LOB810 | 2 %official | 2 %official | Standard peroxide hardener for PE (dealer: 'hardener for polyester materials', MILESI). Goes in after the accelerator.In PE the hardener is an initiator, not a stoichiometric partner: don't add extra 'for speed' — you get a brittle, over-heated film and a shorter pot life. |
| Hardener | LOB5 | 2 %recommended | — | Only if you need longer pot life, a cool shop or a heavy coat. Not officially listed for LRA923 — run a test panel first. |
| Thinner | S10 | 10 %official | 10 %official | Fast thinner with strong solvency — the default for PE primers; also used to flush the gun. |
| Thinner | S11 | 10 %official | 10 %official | Medium evaporation — for hot shops (above ~25 °C) and big flat panels so the coat flows out and doesn't solvent-pop. |
Percentages are per 100 parts of component A.
Characteristics
- Solids
- 90–97 % part A (estimate)recommended
- Viscosity
- not publishedrecommended
- Density
- 1.05–1.2 g/cm³recommended
- Elasticity
- higher than other Technocolor PE primersofficial
- Transparency
- highofficial
- Hardness
- high (PE family) — sands to a hard, stable basecatalog
- Chemical resistance
- excellent physical-chemical resistance (PE family statement)catalog
- Shrinkage
- practically no shrink-back over time (PE family statement)catalog
- Pot life
- 0.25–0.75 h at 20 °C (15–45 min)recommended
- Drying · Dust-free
- 20–40 minrecommended
- Drying · Touch-dry
- 40 minrecommended
- Drying · Sand or stack
- 8–12 hschedule
- Drying · Full cure
- 24–48 hrecommended
- Drying · Conditions
- 20 °C, 50–65 % RH
- Thixotropy
- norecommended
- Lightfastness
- not rated; PE can shift the tone of an underlying staincatalog
- Cure mechanism
- Radical cure of unsaturated polyester/styrene: peroxide hardener (LOB810) initiated by a metal-salt accelerator (LOB828 / LOB6AA1).recommended
Application
Conventional spray
- Nozzle
- 1.8–2.2 (typ. 2) mmrecommended
- Pressure · air
- 3–4 bar at gun inletrecommended
- Spray viscosity
- 25–40 s DIN4 / VZ-4recommended
- Consumption
- 150–200 g/m²official
- Wet film
- 130–190 µmrecommended
- Coats
- 1–2schedule
- Flash-off
- 30–40 minschedule
- Recoat
- second PE coat once gelled (30–40 min, same day, no sanding); topcoat only after sanding at 8–12 hschedule
- Sanding between coats
- none between wet-on-gel PE coats; after 8–12 h sand P240–P320 before pigmented PU, P360–P400 before clear PUschedule
Mix only what you'll spray in 15–20 min — it gels in the cup. Flush the gun with S10 straight away; cured PE won't come out.
HVLP
- Nozzle
- 1.8–2 (typ. 1.9) mmrecommended
- Pressure · air
- 2–2.5 bar at gun inlet, trigger pulledrecommended
- Pressure · Cap
- 0.7 barrecommended
- Spray viscosity
- 22–30 s DIN4recommended
- Consumption
- 150–200 g/m²official
Expect 12–15 CFM at the gun with a heavy primer — make sure the compressor keeps up. 15–20 cm distance, 50 % overlap.
Airless
- Nozzle
- 0.33–0.43 mm (tip .013–.017 in)recommended
- Pressure · fluid
- 100–160 barrecommended
- Consumption
- 150–200 g/m²official
For PE use only a plural-component rig with separate catalyst feed (the official ETS50 schedule specifies 'airless with 2 intakes'), otherwise the mix will gel in the pump.
Airmix (air-assisted airless)
- Nozzle
- 0.28–0.38 mm (tip .011–.015 in)recommended
- Pressure · fluid
- 12–20 barrecommended
- Pressure · air
- 1–2 barofficial
- Consumption
- 150–200 g/m²official
Same as airless: separate catalyst feed, or flush the whole system with S10 well before the pot life runs out.
Process and compatibility
- Substrate preparation
- Sand bare wood/veneer P150–P180 (P220 on MDF), dust off; stain (e.g. CIT) dried before primingschedule
- Goes over
- CIT (stain) / bare sanded wood / veneer / PTS71 (PU isolant, on MDF)
- Goes under
- PTL500 (clear PU, after sanding) / PPL200 (PU enamel, after sanding) / ETL200 (PE gloss lacquer)
- Sanding
- After 8–12 h at 20 °C (ETS50) or 30 min at 30–35 °C + 12 h at 20–25 °C (EPS20): P240–P320 + K150/K180 pads before pigmented PU, P360–P400 before clear PUschedule
- Temperature and humidity
- 18–25 °C (material, part and shop), RH 50–70 %recommended
- Don'ts
- never mix accelerator and hardener directly
- don't exceed 2 % hardener and 2 % accelerator
- don't spray below 15–18 °C
- don't put PE over oils, waxes, nitro products or oily species (teak, rosewood) without an isolating coat — they inhibit the cure
- don't leave mixed material in the gun or lines past the pot life
Storage
- Storage temperature
- 5–25 °C, closed original tin, out of sunlightrecommended
- Shelf life
- not publishedrecommended
- Packaging
- not publishedrecommended
Safety: Flammable (styrene and solvents). LOB810 is an organic peroxide (oxidiser, corrosive to eyes); the accelerator is a metal salt. Store and measure them separately with their own measures. Spray in a booth, wear an A2 organic-vapour respirator, gloves and goggles. Soak peroxide rags in water before disposal.
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 product page: properties, spray 150–200 g/m², LOB810 2 %, S10/S11 10 %, LOB828/LOB6AA1 2 %
- dealer search — no result for LRA923
- dealer PE section — LRA923 not listed
- LOB810 dealer page (MILESI PE hardener)
- LOB5 dealer page (MILESI slow PE hardener)
- sibling clear thixotropic PE primer, same recipe
- sibling clear PE primer (LOB810/LOB828/S10)
- sibling white PE primer allowing LOB810/LOB5
- analogue PE primer pot life/drying
- S10 official
- S11 official
- analogue PE schedule (ETS50, airless 2 intakes)
Not covered by the sources
- No dealer page (t-colormarket.ru does not stock LRA923) and no TDS/SDS found — all quantitative characteristics are unpublished
- solids % part A (estimated 90–97 % from siblings)
- viscosity part A
- density
- pot life (estimated from ETS20)
- drying times dust-free / touch / sand / full (estimated from ETS20 and analogue schedules)
- difference between LOB828 and LOB6AA1 accelerators
- whether LOB5 slow hardener is approved for LRA923 (allowed for sibling LRR16)
- whether thinner can go above 10 % (siblings allow 10–15 %)
- shelf life, packaging sizes
- not used in any official finishing schedule
- not in the 2025–2026 catalog transcript