UV-cure acrylate (VTS40041 100 %-solids UV primer + VTL30040 solvent-borne UV lacquer) over a solvent-borne dye stain (CTU + CFS1 binder + S12)
Mouldings and picture-frame stock — UV finish
- Substrate
- Solid-wood mouldings and picture-frame stock (profiles, frame mouldings, trims), prepared with K60–K80 abrasive brushes.
- Result
- Transparent stained finish that keeps the wood grain visible, 40-gloss semi-matt clear; inline process with UV curing — parts can be packed as soon as they cool.
- 01
Sanding
Abrasive: K60, K80
Abrasive brushes (abrasive-filament), not belts, so the tool follows the profile. K60 removes fuzz and cutter marks, K80 refines the scratch before staining.
- 02
Stain application
CTU 100 %CFS1 150 %S12 500 % (Thinner)
- Nozzle
- 1–1.3recommended
- Pressure
- 1.5–2recommended
- Consumption
- 80
80 g/m² is the low end of the official CTU rate (80–100 g/m²). Don't flood — dye pools and darkens in the profile recesses. On a vacuum line the stain can also go through a vacuum chamber (common practice, not in the schedule).
- 03
Drying
Drying: [object Object] °C, 5 min
All S12 must be gone before priming: VTS40041 has no flash-off, so trapped solvent under it causes bubbles and poor adhesion. The dealer's 2 h full dry for CTU is for stand-alone dye; inline the schedule's 5 min applies.
- 04
Priming
VTS40041 100 %
- Consumption
- 100
100 g/m² is the top of the official range (80–100 g/m²). 100 % solids, no flash-off needed before UV. Keep the tank temperature stable — viscosity governs the film weight.
- 05
UV lamp cure
Drying: UV pass at 30 m/min (seconds under the lamps)
Intermediate ('sanding') cure at a fast belt speed, 30 m/min. Lamp count/power not given for this step; by analogy with step 9, 80–120 W/cm lamps.
- 06
Sanding
Abrasive: K120, K150
Brush-sand the cured primer to knock down raised grain and key it for intercoat adhesion. Don't cut through to the stain on profile edges.
- 07
Lacquer application
VTL30040 100 %S11 20 % (Thinner)
- Nozzle
- 1.5–1.8 (typ. 1.6)recommended
- Pressure
- 2.5–3.5recommended
- Consumption
- 150
The schedule's 150 g/m² is above the official lacquer rate (110–130 g/m²) because it includes 20 % thinner (≈125 g/m² of lacquer itself). Watch for sags on vertical profile faces — the lacquer isn't thixotropic.
Mix for this step
Mix calculator
gRatio 100 : 20.0
Component Weigh out VTL30040part A 417 g S11Thinner 83.3 g Total 500 g Covers roughly 3.33 m² at 150 g/m².
Pot life of the mix: not applicable (1K); keep the cup and lines shielded from daylight/UV.
- 08
Flash-off
Drying: [object Object] °C, 5–10 min
Mandatory flash-off: the solvent (≈55 % of the lacquer plus the S11) must leave before the lamps, otherwise haze, bubbles and under-cure.
- 09
Final UV cure
Drying: 3 lamps 80–120 W, belt 10 m/min
Final cure: 3 lamps at 80–120 W (normally W per cm of lamp length), 10 m/min. Parts can be packed once cool.
Ask about this system
Answers are based on this finishing schedule and its products.
System characteristics
- Vocabulary
- Terms follow the official 'Основные характеристики ЛКМ' page: вязкость, тиксотропность, степень блеска, жизнестойкость, время сушки, адгезия, сухой остаток, твёрдость, эластичность, износостойкость, химическая стойкость, светостойкость, укрывистость.official
- Solids
- Primer VTS40041 100 %; lacquer VTL30040 44–46 % (part A), ≈37–38 % in the 20 %-thinned mix; stain mix — not published.official
- Total build
- ≈115–145 µm dry before the primer is sanded (primer ≈85–95 µm + lacquer ≈48–55 µm + stain <5 µm); ≈105–135 µm after K120/K150 brushing.recommended
- Gloss level
- 40 gloss units at 60°official
- Hardness
- High: UV acrylate film, lacquer described as 'scratch- and scuff-resistant', hardness is reached immediately after UV. No numbers (pencil ASTM D3363, pendulum ISO 1522) published.catalog
- Wear resistance
- Good: VTS40041 is described as having 'strength and wear resistance', the lacquer as scuff-resistant. No Taber data published.catalog
- Chemical resistance
- High physical-chemical resistance (water, alcohol, coffee — the usual furniture tests); the catalog recommends the VTL300XX series even for bathroom furniture. No test protocols published.official
- Lightfastness
- Moderate, limited by the dye: transparent CTU dyes are brighter but less lightfast than pigment stains (catalog). The UV acrylate clear yellows little. For frames on a sunny wall, test a panel or switch to a pigment stain.recommended
- Adhesion
- Relies on keying the primer with K120/K150 brushes before the lacquer and on full S12 flash-off from the stain before the UV primer. No cross-cut (DIN 53151) data published.recommended
- Elasticity
- Limited: UV films are hard and relatively brittle; at ~120–140 µm on a profile, cracking on sharp arrises or with wood movement is possible — don't exceed the schedule rates.recommended
- Pot life
- Not limited: every material is 1K (no hardener); keep UV materials closed and shielded from daylight.recommended
- Viscosity
- Not published. Guide: stain mix ≈10–12 s, lacquer with S11 ≈18–22 s (DIN4, 20 °C); VTS40041 is used as supplied, viscosity follows tank temperature.recommended
- Thixotropy
- norecommended
- Hiding power
- n/aofficial
- Drying time
- Dust-free / touch-dry / stackable — straight out of the UV tunnel once cool; full cure of the UV film within ~24 h (post-cure).recommended
- Coats
- 3
- Coats detail
- stain + primer + topcoat
- Min cycle time (h)
- 0.25
- Min cycle time: why
- Derived: 5 min stain flash + 5 min lacquer flash (minimum) + UV passes (seconds at 30 and 10 m/min) + two brushing passes + cooling/handling ≈ 15 min end-to-end on an inline machine.