Wound sealant

Wound sealant
A number of compounds formulated to seal cuts made on branches or the
trunk of bonsai to prevent the loss of moisture and promote heeling.
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Cut Paste or Wound Sealant is essential for protecting pruning wounds. Pruning wounds that are sealed heal far quicker and are less likely to become infected or dry out causing prolonged healing time.

Kiyonal Bonsai Wound Sealant, 100gm
Kiyonal Bonsai Wound Sealant 100g Imported from Japan This traditional dressing seals tree wounds.
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Be sure to use wound sealant. Leaf pruning can be carried out in early summer
Style and wire trees. Be sure to take before and after photographs
Any wire which is beginning to bite into bark should be removed, but do replace if necessary ...

When pruning branches you should always use sharp tools and seal the wound to help the healing process. Japanese cut paste or wound sealant are ideal for this.

Woody - The description of a plant stem that has hardened and will not die off in winter conditions or during the plants dormancy.
Wound sealant - A compound formulated to seal a cut in a branch or trunk, ...

first, the fact that all of the leaves have dropped off of your bonsai is a good sign that it has entered dormancy and, therefore, will not 'bleed' or lose sap when it is pruned (although it is still advisable to apply 'cut-paste' or 'wound sealant' ...

Wound sealant should be used for after branches have been cut. The easiest way to apply it is to use something small but round and that has a medium sized diameter depending on the size of your tree.

See also: Trunk, Tree, Bonsai, Bark, Plant