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Thiroclair – Crystal Varnish

THIROCLAIR is a solvent-based, hygroreactive polyurethane varnish better known as Crystal Varnish. This product offers an excellent quality/price ratio. It provides the floor with a very durable finish that is highly resistant to wear, water, alcohol and common household products. Thiroclair is specially designed for interior applications. This varnish is available in gloss finish 100-37 / 100-42 and semi-gloss 200-37.

Would you buy this product?



  • High durability
  • Thick finish
  • Hides the flaws well
  • Abrasion resistant


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Building components



Hardwood floor

Covering rate

9,3 to 14,7 m2/L (380 to 600 ft2/gallon)



Preparation / Application

Application temperature

15°C to 35°C Best conditions : 25°C et 50% H.R.

Application tools

Pure silk brush / Pad applicator

Surface preparation

Sand the surface completely in the direction of the wood fibers with #80 coarse paper and then sand the surface with #120 fine paper until a smooth, even finish is obtained. All dirt and foreign matter must be removed with a vacuum cleaner, followed by a final cleaning with a pad moistened with solvent to remove all traces of dust. It is recommended to use Thiroco Sealer100, Sealer101 or Sealer102 as primer.


At the time of application, the temperature of the air and substrate should be between 15°C and 35°C. Use in well-ventilated areas without drafts during application and during drying. It is important to thoroughly mix the product before and during the application. Pour a small amount of varnish directly on the floor or into a paint tray and apply evenly using a pure silk brush or applicator pad. Allow a minimum of drying time between each layer depending on the ambient conditions. Between each coat, lightly sand the surface with #180 or #220 fine paper in the grain direction of the wood. Remove dust from sanding. For better durability, it is recommended to apply two coats of Thiroclair if a sealer has been used as a primer or three coats of varnish if no sealer has been used.


The Thiroclair reacts to moisture. Temperature and relative humidity are critical factors for proper drying of the product. Drying is accelerated at high temperature and humidity and vice versa. Under normal conditions (around 25°C and 50% RH), it is possible to walk on the floor after 24-30 hours. Wait 48 hours before replacing the furniture. Since the final properties of the coating are obtained after 7 days, do not lay carpets or clean the floor until the product has completely matured. The drying time depends on the application method, the temperature and the porosity of the surfaces.

Caution / Cleaning / Storage

Restriction / Caution

This product should not be used alternately with another product. It is recommended to remove all food from the application site when using Thiroclair Varnish. Solvents from this product may alter the taste of foods in cabinets, refrigerators and freezers.No smoking. Keep out of the reach of children. Keep open container or freshly applied product away from open flames, from anything that could cause sparks such as electrical appliances or other sources of heat.


Mineral spirits


Store this product away from frost. Store in a cool place between 15°C and 25°C. The product may be kept in its original sealed container up to 12 months after the date of purchase by the user. Partially used containers must be sealed under a nitrogen atmosphere and protected from moisture.

Available format

3,78L / 18,9L


The customer must ensure that this product is suitable for the intended purpose. The user assumes full responsibility for the results of an application in accordance with the instructions on this label. Atmospheric conditions, applicator’s skills and surface conditions being beyond the manufacturer’s control, we limit our liability for one year following the date of purchase, with proof of purchase, to replacement of defective material only in its original hermetic container. Port paid plant (FOB plant).