How to Restore Rigid or Brittle Items Using B72 Restoration Adhesive

A cracked ceramic bowl, a broken tab on a resin model, a split joint in a piece of small wooden furniture: all share the same repair challenge. The material has fractured cleanly along a stress plane and the two faces need to be brought back into full, even contact without adding visible bulk at the joint line, without distorting the fracture faces against each other, and in some cases while preserving the option to reverse the repair later if needed.

Most hardware-store adhesives are formulated for maximum bond strength, which is not always the correct priority for rigid items. A joint bonded with an inflexible adhesive transfers stress to the material immediately adjacent to the repair, and brittle items fracture at those concentration points. B72 Restoration Adhesive is the product used in museums and conservation studios worldwide specifically because it bonds strongly to rigid surfaces while remaining reversible and stable over time. It does not yellow, does not become brittle with age, and can be dissolved and removed without damaging the substrate if a repair needs to be redone.

What You'll Need

• B72 Restoration Adhesive
• Isopropyl alcohol for cleaning (99% purity preferred)
• Fine cotton swabs
• Masking tape or modelling clay (for positioning)
• Latex or nitrile gloves
• Magnifying glass (for small, detailed repairs)

How To Do It

1. Dry-fit all fragments before applying any adhesive

Before opening the adhesive, test-fit all broken pieces together on a flat surface. For a multi-piece break, this establishes the correct assembly sequence: some fragments have to go on in a specific order or later pieces will not fit cleanly. Identify which piece goes first, second, and so on, and mark them lightly with a pencil on the underside if there are more than three pieces.

2. Clean the fracture faces

Wipe both fracture faces with isopropyl alcohol on a cotton swab and allow to dry for five minutes. Any dust, grease, old adhesive residue, or moisture on the fracture surfaces will prevent B72 from making full contact. For ceramics with a glaze, the fracture will expose bare clay body which is porous: clean thoroughly but avoid soaking the porous surface with too much IPA, which can carry contaminants into the pores. One careful wipe per surface is enough.

Timing: 5 minutes drying after IPA cleaning

3. Apply B72 to one face only

Apply a thin, even film of B72 Restoration Adhesive to one fracture face only. For small items, a cotton swab provides enough control for precise application. The film should be thin and complete. B72 at full concentration is relatively viscous: if the fracture gap is very thin, diluting slightly with acetone can help it flow into hairline cracks without requiring excessive pressure to close.

4. Bring the pieces together precisely

Position the second piece carefully above the first and lower it into contact rather than pressing horizontally, to avoid smearing adhesive out of the joint. Bring the surfaces together and apply light pressure for 30 to 60 seconds. For a well-fitting fracture, the pieces will locate naturally at the correct alignment. Do not over-squeeze: excess B72 forced out of the joint is harder to remove after curing than before.

Timing: 30 to 60 seconds hand pressure

5. Support and hold position during cure

Stand the item in a position where it can sit undisturbed during the cure period. Use modelling clay, rolled masking tape, or a small sandbox to support it in the correct orientation without stressing the repair joint. Do not use clamps on brittle ceramics or glass as the concentrated pressure can cause secondary fractures adjacent to the repair.

6. Remove any squeeze-out before it cures

Any B72 that has been pressed out of the joint can be removed from the surface with a cotton swab dampened with acetone while it is still wet. This is significantly easier than removal after curing. On a glazed surface, B72 wipes off cleanly. On a porous, unglazed surface (terracotta, unglazed stoneware, bare wood) removal is more difficult and it is better to apply less adhesive initially than to deal with squeeze-out afterward. Allow the repair to cure overnight before handling.

Timing: Overnight cure before handling

Prevention Tip

For ceramics and models that are displayed rather than used, position them away from areas of accidental contact: table edges, shelving near doorways, and surfaces that are moved regularly for cleaning. The majority of ceramic breaks that come into repair happen at the same few points: the handle of a mug, the base of a vase, the projecting detail on a figure. Positioning valuable or fragile items with those vulnerable elements away from the edge of the shelf and away from each other is the most effective single step.

Common Questions

Is B72 suitable for items that will be used, or only for display pieces?

B72 Restoration Adhesive is a conservation adhesive optimised for stability, reversibility, and long-term colour stability. It is not rated for structural loads or thermal cycling (dishwashers, for example) that a functional ceramic item would experience. For a decorative or display item, B72 is the correct product. For a mug, plate, or bowl that will go back into daily use including washing, a food-safe structural adhesive is the appropriate choice.

What makes B72 different from standard superglue or epoxy?

Standard superglue (cyanoacrylate) cures rigid and brittle and yellows over time. Epoxy cures rigid and is not reversible once cured. Both can cause secondary damage to brittle substrates through stress concentration at the bond joint and are nearly impossible to remove cleanly if a repair needs to be redone. B72 remains stable and non-yellowing over decades, can be dissolved and removed with acetone without damaging the substrate, and is used in national museums worldwide for exactly these reasons.

My broken ceramic has a hairline crack rather than a full break. Can B72 seal it?

Yes. For a hairline crack where the piece has not fully separated, dilute B72 slightly with acetone and apply it to the crack with a cotton swab, allowing the thinned adhesive to wick into the crack by capillary action. Allow the solvent to evaporate fully and the B72 will consolidate the crack without adding visible bulk at the surface. This is a standard conservation technique for stabilising cracks in ceramic and glass.

Can I use B72 on wooden items?

B72 bonds to most rigid surfaces including wood, but for structural wooden joint repairs (furniture joints, split wooden handles) a PVA wood glue provides higher shear strength and is more appropriate. B72 is the right choice for wooden items where the priority is minimal visible repair and reversibility, such as small decorative carvings, picture frames, or antique wooden objects where conventional wood glue would show.