• 3710 - 8 oz Jo Sonja Crackle Medium_1080x1920

Jo Sonja Crackle Medium

  • Jo Sonja Crackle Medium

    Use Chroma’s Jo Sonja Crackle Medium to create a fine crackle pattern over a basecoat colour or a completed painting. Crackle pattern will vary depending on the thickness of the uncured base colour and application of the Crackle Medium.

  • Characteristics
    One-step crackle medium
    The medium will craze or crackle as it dries.
    AP-approved non-toxic
    Clean up with soap and water.
    Available in 250ml bottles
    Approx. coverage: 1oz = 2 sq ft
  • Techniques
    Apply a thin coat of medium for fine cracks, moderate coat of medium for medium cracks, thick coat of medium for large cracks.
    When final basecoat is dried to touch, apply Crackle Medium working a small area at a time with brush suitable to surface size. Work quickly using a criss-cross motion to apply Crackle Medium. Slightly blend out the brushstrokes as you apply the medium. The crackle pattern will follow the direction of the brushstrokes. Do not brush back over previously applied medium that has started to dry as doing so may cause the Crackle Medium to lift. Crackle Medium will level out slightly as it dries and will dry clear.
    Allow to air dry undisturbed.
    Crackle Medium is formulated to separate into a crazed or crackle pattern as it dries. Paint layers that have dried but not cured may also separate. The thicker and fresher the paint, the deeper and cleaner the crackle pattern will be. DO NOT USE A HAIR DRYER between coats of base color. Warm air will cure the paint and prevent the crackle from working properly. The base color will show through the crackle pattern if an uncured contrasting color is applied before the application of the Crackle Medium
    After crackled surface is completely dry, gently sand surface using #400 to #600 grit sandpaper until desired smoothness is attained. Wipe to remove dust. Any that remains in the crackle pattern will disappear with antiquing or glazing.
    Crackle Medium will leave surface slick. Pattern application may need to be modified. Light sanding should decrease “slickness” of the surface.
    Antiquing may be applied to the surface to accentuate the crackle pattern. If painting is applied over the crackled background, 1-2 coats of Clear Glaze Medium may be applied as a barrier coat. Thin contrasting color with Retarder Medium and brush into cracks. Remove the excess with a soft cloth moistened with Retarder Medium.
    Allow to dry completely before varnishing. A coat of Clear Glaze Medium is recommended prior to varnish application.
    Crackle Medium can also be applied after painting the design or over photocopies or prints, which will produce fine crazing for an aged effect. A coat of Clear Glaze Medium is recommended prior to crackle application. You may choose to antique the surface to accentuate the crackle pattern. A light sanding before antiquing is recommended.

Jo Sonja’s Artists’ Colours Tutorials

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