Description

Faber GL 88 Marble and Natural Stone Mastic

Faber GL 88 is a professional polyester resin mastic developed for bonding, filling, grouting and repairing marble, granite, travertine, agglomerated stone and other natural stone surfaces. Its high-performance formulation provides excellent mechanical strength, chemical resistance and a bright finish after hardening.

Available in solid, semi-solid consistencies, GL 88 can be selected according to the type of repair and the working position. It is suitable for a wide range of stone fabrication, installation and restoration tasks, including filling holes, repairing chips, joining slabs and grouting natural stone.

GL 88 is available in transparent, white, black and straw. It can also be customised using Faber Coloring Paste before the catalyst is added, allowing the mastic to be matched more accurately to the colour and pattern of the stone being repaired.

Key Features

• Professional polyester mastic for natural stone
• Suitable for bonding, filling, grouting and repairs
• Excellent mechanical and chemical resistance
• Produces a bright finish after curing
• Designed to maintain colour stability over time
• Available in solid, semi-solid and liquid grades
• Available in clear, white and coloured versions
• Can be tinted using Faber Coloring Paste
• Suitable for indoor and outdoor applications
• Fast curing at normal working temperatures

Benefits of Faber GL 88

Faber GL 88 provides a strong and dependable solution for professional stone bonding and repair work. Once mixed with the supplied catalyst, the polyester mastic hardens to form a durable repair with excellent resistance to mechanical stress and normal chemical exposure.

Its bright finish makes it particularly suitable for polished marble, granite and other decorative stone surfaces where the appearance of the completed repair is important. The range of available consistencies also allows installers and fabricators to select the most practical grade for horizontal, vertical or detailed repair work.

For more accurate colour matching, GL 88 can be tinted before catalysing using Faber Coloring Paste. This makes it possible to create custom shades for natural stone that may not match a standard mastic colour.

Suitable Applications

Faber GL 88 can be used for:

• Bonding marble and natural stone
• Joining stone slabs
• Filling holes and surface imperfections
• Repairing chips and damaged edges
• Grouting natural stone tiles and slabs
• Filling cracks and small cavities
• Stone fabrication and workshop repairs
• On-site installation and restoration work
• Indoor stone repairs
• Outdoor stone applications

Suitable Materials

Designed for use on:

• Marble
• Granite
• Travertine
• Agglomerated stone
• Engineered stone
• Natural stone tiles
• Natural stone slabs
• Other compatible stone surfaces

Available Grades

• Solid: Suitable for filling, shaping and repairs where a firm consistency is required
• Semi-solid: Suitable for general bonding, filling and repair applications
• Liquid: Suitable for fine cracks, narrow joints and applications requiring greater flow

Colour Matching

If the colour of GL 88 needs to be adjusted, add Faber Coloring Paste before mixing in the catalyst. Work the colouring paste gradually into the uncatalysed mastic until a uniform shade is achieved.

Check the colour against an offcut or an inconspicuous area of the stone before adding the catalyst. Once the catalyst has been mixed into the mastic, the curing process begins and the available working time becomes limited.

Technical Specifications

Surface Preparation

The surface must be completely dry and free from dust, grease and other contamination before application. Do not apply GL 88 to wet, dirty or overheated materials.

Protect surrounding areas that are not being treated. Before completing the full application, carry out a preliminary test on an offcut or an inconspicuous section to confirm suitability and colour compatibility.

Application

If colour adjustment is required, mix Faber Coloring Paste into the GL 88 before adding the catalyst.

Add the supplied catalyst to the mastic. A catalyst ratio of approximately 2% is recommended for correct hardening, although the exact amount may vary according to the working conditions. Do not use less than 1% or more than 3% catalyst.

Mix the mastic and catalyst thoroughly until a smooth and uniform mixture is obtained. Apply promptly using a spatula and avoid leaving unnecessary excess product on the surface.

At approximately 22°C, GL 88 dries and hardens in around 35 minutes. Temperature and site conditions may affect the curing time.

Application Equipment

• Spatula
• Clean mixing surface
• Suitable mixing tool
• Personal protective equipment

Equipment Cleaning

Clean application tools with alcohol immediately after use and before the mastic has fully hardened.

Storage

Keep the container tightly closed and store it in a cool, dry place. When stored correctly in its original sealed packaging, the product has a shelf life of approximately 12 months.

Why Choose Faber GL 88?

• Professional-grade stone mastic
• Strong and durable after curing
• Suitable for bonding and filling
• Bright finish for polished stone
• Good colour stability
• Multiple consistencies available
• Can be customised using Faber Coloring Paste
• Suitable for indoor and outdoor use
• Compatible with many natural stone materials
• Ideal for fabrication, installation and restoration

Frequently Asked Questions

What is Faber GL 88 used for?

Faber GL 88 is used for bonding, filling, grouting and repairing marble, granite, travertine, agglomerated stone and other natural stone tiles and slabs.

Can Faber GL 88 be used outdoors?

Yes. GL 88 is suitable for both indoor and outdoor applications when used on compatible, properly prepared surfaces.

How much catalyst should be added?

A catalyst ratio of approximately 2% is recommended. The amount must not be lower than 1% or higher than 3%.

How long does Faber GL 88 take to cure?

At approximately 22°C, the mastic dries and hardens in around 35 minutes. The actual curing time may vary according to temperature and working conditions.

Can Faber GL 88 be colour matched?

Yes. Faber Coloring Paste can be mixed into the uncatalysed mastic to create a shade that more closely matches the stone being repaired.

When should the colouring paste be added?

Add the colouring paste before the catalyst. Complete the colour match first, check it against an offcut and only then mix in the catalyst.

What surfaces should GL 88 not be applied to?

Do not apply the product to wet, dirty or overheated surfaces. The stone must be dry and free from dust and grease before application.

How should application tools be cleaned?

Clean the tools with alcohol immediately after use, before the remaining mastic has hardened.

Order Faber GL 88 Today

Bond, fill and repair marble and natural stone with Faber GL 88, a professional polyester mastic offering excellent strength, a bright finish and reliable colour stability. Available in multiple grades and colours, it is a versatile solution for stone fabrication, installation and restoration work.