Bostik A326-Fill A Gap Product Description
Bostik A326-Fill A Gap is a single-component, water-based acrylic gap filler for general-purpose applications. This gap filler is easy to use and economical, providing excellent adhesion for gaps and joints with low movement.
Product Key Features (KEY FEATURES)
Excellent sealing and adhesion properties
Skin formation within 15 minutes
Can be overpainted with acrylic paint
High bonding strength
Excellent water resistance once fully cured
Sag resistant
Product Description (PRODUCT DESCRIPTION)
Bostik A326 FILL A GAP CLASSIC is a single-component, water-based, paintable acrylic sealant suitable for general-purpose joint sealing applications.
The product is easy to use and cost-effective, providing excellent adhesion for filling gaps and sealing joints with low movement.
Recommended Uses (RECOMMENDED USE)
Filling cracks in plasterboard
Sealing joints around window and door frames
Sealing joints around ceramic tiles
Sealing low-movement joints
Filling cracks before painting
Filling cracks in masonry and concrete walls
Sealing joints between lightweight partition walls
Sealing joints around skirting boards and decorative door and window trims
Application Procedures (APPLICATIONS)
1. Hold the caulking gun at a 45-degree angle and squeeze the trigger with consistent pressure.
2. While dispensing the sealant, move the caulking gun along the crack or gap at a steady speed.
3. Smooth the sealant surface using a wet finger, or gently remove excess material with a putty knife or damp cloth.
4. The material will become touch-dry within 30 minutes under normal conditions.
Precautions (PRECAUTION)
The product is not recommended for the following applications:
Underwater applications
Areas subject to abrasion or physical impact
Sealing joints that are submerged in water
Application on damp substrates
Joints with movement exceeding 10° or exterior applications where rainfall is expected within 4 hours
Approximate Technical Data (TECHNICAL DATA)
Typical properties tested at 25°C and 50% Relative Humidity (RH).
| Properties | Details |
|---|---|
| Appearance | Smooth, creamy paste consistency |
| Colour | White |
| Chemical Type | Water Based Acrylic |
| Specific Gravity | Approximately 1.6 |
| Service Temperature | -20°C to +75°C |
| Application Temperature | 5°C to 50°C |
| Tool Working Time | 15 minutes at 20°C |
| Tack Free Time / Skin Time | 15 minutes |
| Full Cure | 2–3 days (depending on temperature) |
| Max. Joint Movement | ±5% |
| Max. Joint Width | Up to 25 mm in localized areas |
| Flammability | Non-flammable |
Paintability (PAINTABILITY)
Bostik A326 FILL A GAP CLASSIC can be painted over once the material has fully cured.
Coatings containing high levels of solvents, such as gloss enamels or high oil-content primers, may react with the surface of the sealant, causing it to become tacky.
It is therefore recommended to conduct a test application on a sample area beforehand to ensure proper compatibility between the paint and the sealant.
To achieve an attractive finish and optimal performance, the paint applied over the sealant should have elongation properties similar to those of the sealant.
Certain thick-film, flexible coatings, such as high-quality acrylic emulsions, can accommodate minor joint movement without causing significant deformation of the paint film.
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