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Jo Sonjas

Poly Varnish Gloss | Medium - 237ml Bottles

Poly Varnish Gloss | Medium - 237ml Bottles

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Jo Sonja Polyurethane Water Based Varnishes are available in Gloss, Satin, and Matte finishes. These clear, non-yellowing varnishes dry quickly and are formulated to be durable enough for both indoor and outdoor use. The Matte and Satin varnishes should be shaken gently before use to evenly distribute the matting agent; over shaking may lead to bubbles.


  • Preparation: A coat of Clear Glaze Medium is recommended as a barrier coat prior to varnishing, especially in areas with high humidity or variable climate conditions.
  • Application: Use the varnish full strength. If thinning is necessary, add a few drops of Flow Medium or Retarder, but take care not to over-dilute.
  • Technique: Apply in thin layers using a criss-cross motion with a soft but firm bristle brush, appropriate for the surface size. Finish with smooth strokes in the direction of the wood grain.
  • Drying: Allow to air dry for at least an hour before applying additional coats. The total drying time will vary depending on the local climate and humidity.
  • Sanding: After applying three coats, sand lightly if 24 hours have elapsed between coats to ensure proper adhesion.
  • For Enhanced Durability: For an alcohol-resistant finish or for use outdoors, apply a minimum of 4 to 5 coats of varnish. Allow the varnish to cure for at least two weeks before use.
  • Using a Hairdryer: If using a hairdryer for surface drying, hold it away from the surface to avoid excessive heat, which could cause crazing.

Additional Information:

  • Not Suitable For: This product is not recommended for use over oil-based paint or oil-based antiquing finishes.
  • Coverage: Approximately 1 ml covers 251 sq cm, 1 oz covers about 8 sq ft.
  • Safety and Cleanup: This water-based varnish is non-toxic, conforms to ASTM D 4236, and can be cleaned up with mild soap and cool water. It is safe to dry with a hairdryer.
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About Jo Sonjas Paints

The Paint: Jo Sonja's Artists Colours

Discover the vibrant potential of Jo Sonja’s Artists Colours, specially formulated flow formula acrylics that emulate traditional gouache. Crafted from the finest quality, pure pigments, these colours provide artists with exceptional coverage and a velvety matte finish. Ideal for intricate layering, the quick-drying nature allows for overpainting without damaging earlier layers, facilitating seamless corrections and enhancements to your artwork.

Unlike typical craft paints, Jo Sonja's offers a professional range designed for the discerning artist. Each colour is two to three times more concentrated, ensuring that your creations will pop with permanent, brilliant hues. Simplified use comes standard, as these paints are designed for immediate application without the need for complex instructions. Whether you’re a hobbyist or a professional, Jo Sonja’s Artists Colours are engineered to elevate your artistic vision to new heights.


Jo Sonja acrlic paints, About the paints


Jo Sonja's® Artist Colours & Mediums

Founded in 1985 by Jim Cobb, Director of Chroma, and celebrated folk artist Jo Sonja Jansen, Jo Sonja's Decorative Painting System is a testament to innovation and artistic tradition. The collaboration aimed to fulfil the sophisticated demands of serious artists, combining Chroma's cutting-edge technology with versatile, long-lasting products. The system offers unparalleled flexibility, enabling artists to master historical techniques and pioneer new ones, thus securing a robust foothold in the decorative painting market.

Artists around the globe have come to recognize and value the brand's exceptional quality. Jo Sonja’s continues to influence the decorative arts significantly, with Chroma's commitment to innovation and excellence ensuring its ongoing leadership and presence in the market.


The Decorative Painting System

With the range of paints, also comes a range of mediums to allow unlimited techniques.  Acrylic mediums are invaluable if you wish to change the paint consistency or alter drying times.  Chroma has discovered ways of allowing the same set of colours to be applied on a variety of surfaces such as wood, metal, glass and textiles.  The same colours (with the use of the mediums) can be stencilled, stamped, crackled or used in a host of elaborate faux finishes.  By experimenting with the mediums, there are endless possibilities that can be achieved.  Technique information sheets, designed to inspire your imagination, can be found on this website.   Chroma continues its research and development of new products. 

 The range of jo sonjas products

ASTM Standards and Jo Sonja's Artist Colours

Jo Sonja's Artist Colours are crafted using the highest quality pure pigments, adhering to rigorous ASTM (American Society for Testing Materials) standards. This independent body ensures reliable classification for pigment lightfastness and health labelling standards. Each colour in our range boasts an ASTM rating, affirming its resistance to fading and guaranteeing that the hues will remain vibrant and true for generations.

Our ongoing commitment to quality is reflected in continual testing and stringent quality controls, allowing artists to trust implicitly in the enduring brilliance and performance of our paints.


Jo Sonja's Paint Quality and Standards

ASTM Ratings: Ensuring Colour Longevity

ASTM 1 – Excellent Lightfastness: Highest rating, indicating superior resistance to fading.
ASTM 2 – Very Good Lightfastness: Very reliable in maintaining colour integrity over time.

    Note: All Jo Sonja’s paints are rigorously tested and carry either an ASTM 1 or 2 rating, ensuring top-tier durability and fade-resistance for your artwork.

    Archival Quality:

    Archival Standards: Jo Sonja’s paints and mediums are not only lightfast but also archival and lignin-free, making them an ideal choice for artworks intended for long-term preservation.

      By using Jo Sonja’s paints, artists ensure their creations remain as vivid and impactful as the day they were painted, backed by our commitment to quality and enduring performance.