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Jo Sonjas

Tannin Sealer - Jo Sonjas Medium 237ml Bottles

Tannin Sealer - Jo Sonjas Medium 237ml Bottles

Regular price £10.99
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Tannin Sealer is designed for use on wood or Masonite surfaces to prevent tannin, oil, or pitch from bleeding through the paint. It is also effective for adhering gold leaf.


For Tannin Sealing:

  • Application: Apply undiluted directly to a clean, dry surface, covering the knots and extending at least 5 cm beyond, on both front and back sides.
  • Drying: Allow to cure for a minimum of 14 days, depending on climate and humidity. Do not use a hairdryer to hasten drying.
  • When Staining Wood: Stain the surface first, then apply Tannin Sealer as directed.
  • If Tannin Sealer Remains Tacky: Once dry and cured, it remains tacky; seal with Clear Glaze Medium or All Purpose Sealer before applying a basecoat.
  • For Light or Pickled Stains: If dark knots or tannin show through, conceal with a second coat of stain or a coat of Gesso after the sealer has cured.

For Gold Leafing:

  • Mixing: Mix Retarder with Tannin Sealer in a 1:2 ratio and apply a smooth coat.
  • Application: Allow to dry to a tacky state where no fingerprint remains upon touching. Apply 3 coats in total.
  • Applying Gold Leaf: Press gold leaf onto the surface and rub gently with a cotton ball to ensure it adheres properly.
  • Heat Setting: Use a hairdryer with warm air to heat set the gold leaf.
  • Finishing: Allow to dry overnight before buffing to remove excess leaf with a soft cloth or brush.
  • Sealing: Apply a coat of All Purpose Sealer to prevent tarnishing and enhance adhesion before decorating or antiquing with Jo Sonja Matte Flow Acrylic or Wood Stain Gels.

Additional Information:

  • Coverage: Approximately 1 ml covers 251 sq cm, 1 oz covers about 8 sq ft.
  • Safety and Cleanup: Water-based, non-toxic, and conforms to ASTM D 4236. Clean up with mild soap and cool water. 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.