FIBRE GLASS PENCIL (4 mm)

Precision in Every Pass: the 4 mm Fibreglass Pencil from Acrylicos Vallejo

The VAT15001 is a workshop tool from the technical line of Acrylicos Vallejo designed for the preparation and cleaning of surfaces with a level of control that conventional abrasives do not allow. With a working diameter of 4 mm, it reaches difficult areas where sandpaper or grinding discs would never reach.

Main Features

• Working diameter: 4 mm, ideal for tight spaces and fine details.
• Adjustable mechanism: allows regulation of the exposed fibre length, thus adjusting the aggressiveness of the abrasion.
• Controlled abrasive action: with shorter exposed fibre, there is greater rigidity and abrasive power; with longer fibre, the action is softer and more diffuse.
• Material versatility: effective on plastics, resins, metal, and other common workshop substrates.

Function and Performance

Its main mission is the removal of rust, adhesive residues, and accumulated dirt from parts that will be painted, glued, or assembled. By acting in a localized manner, it avoids damaging adjacent areas, which is especially valuable when working with small parts or finishes already applied to the rest of the piece.

The adjustment mechanism transforms this tool into one with two working modes: a fine polishing mode for preparing surfaces before the first coat of primer, and a more vigorous abrasion mode for tackling corrosion points or intense contamination.

Workshop Applications

• Preparation of surfaces before painting with acrylics or enamels.
• Cleaning of joints and contact points in static models.
• Removal of burrs or residues on figures and dioramas.
• Deoxidation of small metal spare or assembly parts.
• Preparation of bonding areas to improve adhesive adherence.

Assembly and Preparation: Usage Tips

To get the most out of the fibreglass pencil, always work with smooth, circular movements, without excessive pressure. Once the pass is complete, remove any loose fibres with a clean brush or compressed air before applying any product to the surface. Fibreglass can be irritating upon contact with skin, so it is recommended to work with gloves and avoid rubbing the eyes or face during the process.

Frequently Asked Questions

What is the difference between using more or less exposed fibre length?

The less fibre protrudes from the body, the stiffer and more concentrated the beam is, which increases abrasiveness. When exposing more length, the fibres bend easily and the effect is softer, suitable for light polishing or for not marking the surface.

Is it compatible with all types of surfaces?

It works well on metals, plastics, and resins. On very soft surfaces or with delicate finishes, it is advisable to start with the minimum fibre length and gradually increase to avoid unwanted scratches.

How do you keep the work area clean?

Fibreglass tends to disperse while working. Protect the area with paper or cardboard and, when finished, remove the remnants with a brush or a gentle blast of compressed air before touching the piece with your hands.

Can the fibres be replaced when they wear out?

The body of the pencil accepts refills of fibreglass of the same diameter. Check the availability of compatible replacements in our store.

Which Vallejo products are recommended for use before painting?

After preparation with the pencil, the surface is ready to receive primers and acrylic paints from the Vallejo range. A clean and slightly abrasive base significantly improves the adherence of the first layers.

The Vallejo VAT15001 fibreglass scratch pen (4 mm) is a precision abrasive tool for surface preparation, rust removal, and cleaning of plastics, resins, and metal parts. Its adjustable mechanism controls fibre exposure length to modulate abrasive intensity, making it a go-to tool for scale modelers, diorama builders, and figure painters seeking clean, well-prepared surfaces before priming or gluing.