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Stains and dyesDye

CLT21

CLT21 Kromolux dye concentrate, grey

Kromolux concentrated transparent dye stain, grey, made by Milesi. Even colour and high strength, so you can go dark and still keep the wood clear. Cut with water or solvent, with or without a binder. Mixes with every other dye in the range in any ratio. There's no official t-color.ru page; the data comes from the t-colormarket.ru dealer page.

  • Colouring all kinds of wood, veneer or solid
  • Grey, weathered and smoked looks on oak and ash
  • Knocking back warm (yellow/red) tones when mixed with other Kromolux dyes

Mix calculator

g
Thinner750.0 %

When: Listed as an approved thinner on the official pages of the other Kromolux dyes (CLT1–CLT10).

Additive

Ratio 100 : 750.0

ComponentWeigh out
CLT21part A58.8 g
LZC97Thinner441 g
Total500 g

Covers roughly 5.56 m² at 90 g/m².

Ask about CLT21

Answers are based on the CLT21 data and the products it mixes with.

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Mixing matrix

  • S10Thinner
    % by weight: 500–1000 %dealer% by volume: 500–1000 %dealer

    Catalog: fast, strong solvent; for stain on fine-pored timber. (The species examples and 'cool shop' are our addition.) The dealer labels S10 'thinner for PE'.

    500–1000 % means 5 to 10 parts thinner to 1 part concentrate. More thinner = lighter, more transparent shade.

  • S12Thinner
    % by weight: 500–1000 %dealer% by volume: 500–1000 %dealer

    Catalog: medium evaporation; for stain on medium-pored timber. Calling it the default is our addition. The dealer labels S12 'thinner for NC'.

    500–1000 % means 5 to 10 parts thinner to 1 part concentrate. More thinner = lighter, more transparent shade.

  • S90Thinner
    % by weight: 500–1000 %dealer% by volume: 500–1000 %dealer

    Catalog: slow evaporation; for stain on open-pored timber. (The species examples, big panels, hot weather and fewer stripes are our addition.) The dealer labels S90 'slow thinner for dyes'.

    500–1000 % means 5 to 10 parts thinner to 1 part concentrate. More thinner = lighter, more transparent shade.

  • LZC97Thinner
    % by weight: 500–1000 %official% by volume: 500–1000 %official

    Listed as an approved thinner on the official pages of the other Kromolux dyes (CLT1–CLT10).

    The dealer doesn't list LZC97 for CLT21. It comes from the official pages of sibling Kromolux dyes (same chemistry). Treat it as an option and try it on a sample first. LZC97's own properties are unpublished.

  • WATERThinner
    % by weight: 500–1000 %dealer% by volume: 500–1000 %dealer

    Water dilution, when you want a solvent-free stain. Deionised water only.

    Dealer note: use only deionised water, or the dye can flocculate and lose colour stability in the can. Water raises the grain, so wet, dry and sand the wood before staining (official wood-prep page).

  • CFH1Additive
    % by weight: 0–200 %dealer% by volume: 0–200 %dealer

    Spray binder for the solvent-borne system: use it when the concentrate is cut with S10/S12/S90.

    0 % = straight dye, no binder. The binder locks the dye in, cuts bleed into the next sealer coat and evens out absorption. The solvent/water pairing comes from the dealer table (CFH1 / CFS1 = 'solvent-borne / water-borne spray binder').

  • CFS1Additive
    % by weight: 0–200 %dealer% by volume: 0–200 %dealer

    Spray binder for the water-borne system: use it when the concentrate is cut with deionised water.

    Solvent/water pairing per the dealer table ('solvent-borne / water-borne spray binder').

Percentages are per 100 parts of component A.

Characteristics

Viscosity
24 ± 2 s (cup not stated; Technocolor convention is VZ-4/DIN4)dealer
Drying · Touch-dry
10–30recommended
Drying · Overcoat (min)
30–120recommended
Drying · Conditions
20 °C, 50–65 % RH (assumed)
Lightfastness
Transparent dye: saturated, bright colour. The catalog credits high lightfastness to the pigment stains, not the transparent ones, so expect a transparent dye like CLT21 to be less lightfast (inference).catalog
Colour strength
Higher concentration than ordinary stains, so dark shades stay transparent («при повышенной концентрации дает возможность получать темные цвета»)dealer

Colours

  • CLT21 · grey

Application

HVLP

Nozzle
1–1.3 (typ. 1.2) mmrecommended
Pressure · air
1.5–2 barrecommended
Spray viscosity
10–12 s DIN4recommended
Consumption
80–100 g/m²dealer
Wet film
95–125 µmrecommended
Coats
1–2recommended
Flash-off
5–15recommended
Recoat
30–120 minrecommended
Sanding between coats
Never sand the stain itself. You cut through the colour on edges. Denib only after the first sealer coat.recommended

15–20 cm from the work, 50 % overlap, gun square to the surface, steady speed. Back off the fluid on vertical panels. Do edges and ends first, then the face.

Conventional spray

Nozzle
1.2–1.4 mmrecommended
Pressure · air
2.5–3.5 barrecommended
Consumption
80–100 g/m²dealer

More overspray than HVLP, but often more even on large surfaces.

Airmix (air-assisted airless)

Nozzle
0.18–0.23 mmrecommended
Pressure · fluid
8–20 barrecommended
Pressure · air
1–2 barofficial
Consumption
80–100 g/m²dealer

For production runs. Skip airless for stain: too much material, and it blotches.

Process and compatibility

Substrate preparation
Sand solid wood or veneer to P150–P220 (open-pored P150–P180, fine-pored P180–P220) and de-dust. If you dilute with water, pre-wet, dry and knock back the raised grain first.recommended
Goes over
bare wood
Goes under
ATS20
Sanding
Don't sand the stain. The first denib goes on the first sealer coat.recommended
Temperature and humidity
15–25 °C, RH 50–70 %; above ~25 °C use slow S90recommended
Don'ts
  • Don't cut it with tap water. Deionised only (dealer).
  • Don't lay it on in one heavy coat. You get blotches and runs.
  • Don't seal before the solvent or water has fully gone.
  • Don't judge the shade wet. Grey shifts a lot under lacquer, so make a sample board with the real topcoat.

Storage

Packaging
1 Ldealer

Safety: (Generic advice, not from an SDS.) Once cut with S10/S12/S90 it's highly flammable. Spray in an extracted booth, wear an A2-filter respirator and nitrile gloves, and keep it away from ignition sources. I couldn't find an SDS for CLT21.

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
  • No official t-color.ru page for CLT21. Every product fact comes from the dealer t-colormarket.ru page
  • Solids content, density and flash point of the concentrate are not published
  • Viscosity unit/cup not stated by the dealer ('24±2')
  • No official drying or overcoat times; the times given are derived
  • No shelf life or storage temperature
  • No lightfastness rating for CLT21
  • No Technocolor/Milesi TDS or SDS PDF found for CLT21
  • LZC97 as a thinner comes from sibling official CLT pages, not confirmed for CLT21
  • CLT series is not in the 2025-2026 catalog (it lists CTU/CPS/CTH instead)
  • No official finishing schedule uses CLT21
  • Properties of LZC97, CFH1 and CFS1 are not published