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Sikkens Cetol TSI Plus

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Sikkens Cetol TSI Plus: Durable Interior Wood Varnish

A high quality solvent based interior wood varnish

Designed to beautify and protect interior woodwork

Medium build with a semi-transparent finish. 

Enhances the wood grain. 

Comes in clear, or can be tinted to semi-transparent shades. 

Perfect for softwood trim, door frames, wooden paneling and furniture.

For brush application. 




More details

We can tint this product to your exact specification from any colour chart or sample. Enter your chosen colour in the box below and click CONFIRM COLOUR before adding the product to your basket. Need help? Call us on 01793 511537




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Product Info

Sikkens Cetol TSI Plus - Satin Interior Wood Varnish

Sikkens Cetol TSI is a hard-wearing and durable solvent based varnish for interior wood work. The high-quality varnish is of medium build and will protect your interior woodwork and joinery from knocks, spills and abrasion. It is also resistant to water and mild household detergents. 

Perfect for use on interior softwoods and hardwoods. Perfect for protecting surfaces such as interior window frames, handrails, skirting, wood paneling, doors, furniture etc.  Can also be used on domestic wooden floors that are subject to light traffic. 

This solvent based varnish is easy to apply by brush, with a 3-coat system. Creates an attractive satin finish that enhances the natural wood grain of the timber. Comes in clear, or can be tinted to one of the 7 ready mixed Sikkens Standard shades, or choose one of the semi-transparent shades from the Sikkens Classic or Sikkens Style collections. 


Properties of the Sikkens Cetol TSI Plus:

- Solvent based Interior Wood Varnish

- Attractive Satin finish

- Semi-transparent finish enhances the wood grain

- High-quality and hard-wearing

- Protect woodwork from knocks, spills and abrasion.

- Resistant to water and mild household detergents

- Can be a clear wood varnish

- Also available in three tinted semi-transparent colour ranges: Sikkens Standard, Classic Collection and Style Collection

- Easy brush application

- Can also be used for light-traffic domestic flooring


Surface Preparation

Before proceeding with your coating system, ensure that the moisture content of the timber does not exceed 16%.

Ensure the timber surface is abraded, clean,and dry and is free from dust, dirt, wax and grease. Ensure to remove any existing surface mould and/or algae using a fungicidal solution.

Any resinous residues may be removed using a suitable solvent or methylated spirit. If using methylated spirit, allow the solvent to fully evaporate before over-coating. 

Knotting solution may be used to reduce extractive discolouration, however, knotting solutions are not always effective in 'sealing in' the resin.


Application of Sikkens Cetol TIS Plus onto New Woodwork or Timber

If applying to new woodwork coat the timber with 3 coats of Sikkens Cetol TSI Satin Plus.

For best results with this product, apply the Cetol TSI Plus with a long-haired soft bristle brush.

The product should be applied in a full flowing coat, laying off in the direction of the grain. Try to use a minimum number of brushstrokes to ensure the best finish. Where possible, avoid over brushing, as this will produce brush marks and a poor quality finish. 

Apply to a minimum wet film thickness of 54 micrometers. 

Allow for 16 hours between coats. For best results, keep the interval between applications of the coats as short as possible.

Apply in a well ventilated area.

Note: Discoloration of paint especially noticeable within light colours may occur over knots and resinous areas present in the wood. Particular attention with regards to preparation should be given to wood such as Oak, Teak, Cedar, Douglas Fir, Mahogany and Idigbo, etc., which contain oil and water-soluble tannin which may impair the drying, hardening or adhesion of surface coatings and discolour the finished surface.


Maintenance of Sikkens Cetol TSI Satin Plus

The Sikkens Cetol TSI does not have a strict or recommended maintenance cycle. However, if you believe your coating needs re-doing you can follow the following advice:

When looking to maintain the coating, take note of the current condition of the finish. Then clean, degrease and sand to create a key. If excessive damage has occurred, the surface must be abraded back to clean bare timber before re-coating.

Repair any defects and remove any sanding dust and apply one or two coats of the Sikkens Cetol TSI Plus. 

If the timber has been previously stained, avoid sanding back to the underlying stain. 

As with any semi-transparent colour, coating or stain, the more coats you apply the darker the shade becomes. Therefore it is recommended that in order to maintain the translucent appearance of the Cetol TSI Plus over a longer period, to use light colours 003, 077 or 006 for maintenance applications.

For maintenance applications, the same drying times and application instructions are applicable.


Damaged and Decayed Timber

All damaged or decayed timber must be removed and replaced before any coatings application.

If looking to remove damaged/decayed timber, cut at least 25mm into sound timber. When splicing in new sections of wood, consider whether the timber species' natural durability is sufficient.

Ensure to thoroughly treat timbers, especially in any end grain sections and ensure all materials are fully dry before splicing in.

Secure with non-ferrous fixings and fill any surrounding voids with a good quality wood filler.


Further Notes:

Joinery should be glazed with a suitable sealant in accordance with section 4.2 of the Glass and Glazing Federation manual together with BS 8000-7 : 1990 Workmanship on Building Sites and BS 6262 : 1982.

Linseed oil putty, type II butyl mastics and metal casement putty are not recommended for use.

The final colour of a semi-transparent stain will always depend on the colour of the timber underneath, and the amount of coats applied. The more coats applied the darker and more solid the colour. For best results, always do a test patch before applying to the whole area.


For more information please refer to the product data sheet.

Technical Data
Finish Satin
Application Brush
Solvent Based Yes
01.Drying Time (Touch Dry) 1-2 hours
02.Drying Time (To handle) 6-8 hours
03.Drying Time (Recoat) 16 hours
04.Drying Time (Full cure) 24 hours
Type Single Pack
m2 / litre 11-13
Colour Sikkens Standard, Classic Collection, Style Collection
Clean Up White Spirit

Sikkens Cetol Design Concept PDF

Sikkens Cetol Design Concept Colour Card and Product Guide

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Product customization

We can tint this product to your exact specification from any colour chart or sample. If you know the reference please enter the code in the field below, click SAVE and add the product to your basket. We also have ideas to set the ball rolling in our Colour section where we have added a number of widely used colour ranges. Need help? Call us on 01793 511537

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