Cuprinol Ultimate Repair Wood Hardener 500ml

Deep Penetrating Rot Treatment & Timber Strengthener

Cuprinol Ultimate Repair Wood Hardener 500ml is a solvent-based wood hardening solution designed to reinforce and stabilise decayed or softened timber prior to filling and repair. Formulated to deeply penetrate porous, rotting wood fibres, it binds and strengthens compromised areas to create a solid base for further restoration.

Ideal for interior and exterior use, this 500ml treatment is suitable for repairing windows, doors, frames and other wooden structures affected by wet rot.

Key Features

• Size: 500ml

• Deep penetrating wood hardener

• Strengthens and stabilises rotting timber

• Suitable for interior and exterior use

• Solvent-based formulation for effective absorption

• Creates a firm base for filling and repair

• Ideal for targeted timber restoration

Reinforces Decayed Timber

Cuprinol Ultimate Repair Wood Hardener is specifically developed to soak into soft, degraded wood fibres and harden them from within. Once cured, the treated area becomes solid and stable, ready to accept a suitable wood filler or repair compound.

Ideal for use on:

• Window frames and sills

• External doors and door frames

• Fascias and soffits

• Timber cladding

• Structural woodwork affected by wet rot

Essential Step Before Filling

For long-lasting repairs, stabilising damaged timber is critical. This wood hardener prepares the surface for use with compatible repair fillers, helping ensure better adhesion and improved durability of the finished repair.

Coverage & Application

• Apply by brush directly onto clean, dry, decayed timber

• Ensure all loose or crumbly wood is removed before treatment

• Allow to fully penetrate and cure before applying filler

• Coverage will vary depending on timber condition and porosity

Always follow label instructions and allow adequate ventilation during application.

Why Choose Cuprinol Ultimate Repair Wood Hardener 500ml?

For homeowners, decorators and property maintenance professionals carrying out timber restoration, this 500ml wood hardener provides a reliable way to reinforce and stabilise rotting wood. It forms a strong foundation for durable repairs, helping extend the life of exterior and interior timber structures.