Jo Sonja 250ml Tannin Block Sealer

Jo Sonja's Tannin Sealer is recommended to prepare surfaces for painting which are likely to 'stain through' paint layers. These may include knotted wood, old lacquered or stripped furniture and masonite.
Tannin Sealer may also be used as a Gold Leaf Size and may be used with real and imitation leaf as an adhesive.

A pre-sealer for treating knotty wood to prevent stains penetrating through the paint layer. Also suitable for restoring furniture with old varnish, and masonite surfaces where tannin, oil or pitch may bleed through paint. 


Directions: Gold Leafing

  • Brush on smooth, even coat of Tannin Sealer and allow to dry. Apply one additional coat and allow to dry naturally until no longer tacky, or no fingerprint is left when touched.

  • Press gold leaf onto this surface; heat gently with a hair dryer before removing the excess.

  • If you are working on a larger item or require longer working time, add a small amount of Jo Sonja's Retarder Medium as required.

  • When gold leafing is complete, apply Jo Sonja's All Purpose Sealer if you intend to paint over the leaf, and to protect it from tarnishing. This can be used on Imitation Gold (or Silver or Copper) Leaf only. Do not use on genuine gold leaf.

  • Two to three coats of Jo Sonja's Varnish will assist in preventing tarnish.

  • Wash hands and brushes in water


Directions: Wood knots

  • Apply undiluted to clean, dry surface, directly over and at least 2" beyond knots. Do not use a hair dryer to dry, as this will encourage pitch or staining to rise through the wood. Apply at least 2 coats.

  • Allow to cure for 7 days before proceeding to paint or decorate.

  • When staining wood, stain first, then apply Tannin Sealer as above.

  • Tannin Sealer dries tacky when cured. This is normal and may be painted over without problem.



Tannin Sealer may be used for pre-sealing items if you have run out of All Purpose Sealer. It may be used the same way. Tannin Sealer should not be applied over oily stains. Adhesion will be poor and oil may still penetrate the Sealer.




Barcode # 9350542004273
Brand Jo Sonja
Shipping Weight 0.3170kg
Shipping Width 0.050m
Shipping Height 0.050m
Shipping Length 0.050m