Jo Sonja Mediums

Jo Sonja Mediums

Mediums make painting easier and give you complete control of the process. From the base coat to the final varnish, there is a Jo Sonja product to suit your individual painting style.

For the full Jo Sonja medium rage see here.

All Purpose Sealer

For pre-sealing and priming almost any porous surface including wood, canvas, unglazed stoneware, bisque, card, paper and treated metal. Use to prevent moisture loss from absorption into the surface. Use also to promote good adhesion of the paint.

Clear Glaze Medium

An acrylic medium to mix with Jo Sonja's Artists' Colours to create transparent colour for glaze techniques, wood staining, pickling, colour floating and blending.

Tannin Blocking Sealer

A pre-sealer for treating knotty wood to prevent stains penetrating through the paint layer. May also be used as an effective gold leaf size.

Flow Medium

Reduces Jo Sonja's Artists' Colours to produce paint with excellent flow control capabilities. Suitable for long strokes, liner work, calligraphy, fine detail and air brushing. Add where thinner paint consistency is required. (Water has a dilutive effect on the pigment and the adhesive qualities of acrylics and should not be used in large amounts).

Crackle Medium

Create 'porcelain' crazed effects over completed paintings. When dry, emphasise cracks by rubbing over with a darker colour. Apply reasonably thickly with a spreading action rather than brushing. Do not overwork. May be sanded smooth when dry.

Décor Crackle Medium

Use this medium in conjunction with Jo Sonja's Artists' Colours to create bold, graphic, crackled effects between layers of paint. Patterns can be varied depending on the thickness and brushing direction of the top coat colour.

Retarder Medium

Slow down the drying time of acrylic paints so you can have longer to work on the piece. For Antiquing, allow your painting to dry for 12 hours, then apply Retarder Medium mixed with your final colour choice. When no wet spots are visible, wipe off where you want the highlights.

Kleister 'Faux Finish' Medium

A transparent extender to mix with Jo Sonja's Artists' Colours to achieve ragging, marbling and graining effects. May also be used as a painting medium to add translucency and slight texture to decorative painting details.

Polyurethane Water Based Varnish

Protect your finished piece with two coats of this beautiful varnish that actually cleans up in water! The second coat even takes care of accidental streaking. Clear and non-yellowing. For serving trays, etc. 4 coats of varnish are needed. Available in Matte, Satin and Gloss.

Textile Medium

Instantly transforms your Jo Sonja's Artists' Colours into durable fabric paints. Mix Textile Medium in equal parts with your colour. Both medium and paint remain soft, supple and permanent on most fabrics. Use on natural fabrics only. Avoid using 100% acrylic fabrics. Heat set with an iron. Place aluminum foil over the design to prevent iron from sticking to the heated paint.

Stroke & Blending Medium

When added to your palette colours it will lubricate the paint, allowing easier brush strokes. Paint will feel creamy and will remain 'open' longer than usual allowing more time for blending and detail. It should be allowed to cure for at least 3 days before attempting to apply a water-based varnish. Mix with Jo Sonja Colours to create a dilution similar to bottle colours.

Wood Filler

Water-based, non-toxic and fast drying, this easy to use filler is ideal for nail holes and blemishes in wood and MDF. Use directly from the tub or thin with up to 10% water to repair minor imperfections or fill grain.


Jo Sonja's Gesso available in: Black or White may be used instead of, or as well as, All Purpose Sealer. Usually applied on very porous or uneven surfaces, the grit will have a slight levelling effect which is beneficial for inferior surfaces or rough edges.

Texture Paste

A heavy impasto paste made from marble dust which dries flexible and will not crack. It may be used to produce texture before or during painting and may be mixed directly with palette colours. Texture Paste dries translucent white and may be over-painted if desired.

For the full Jo Sonja medium rage see here.