Product

FILL A GAP^® EXTERIOR

Acrylic sealant which is rain resistant soon after application

Product overview

Bostik Fill A Gap^® Exterior is a premium exterior acrylic gap filler ideal for sealing joints and cracks around windows, doors, walls, and skirting boards. Great for Australian conditions, it provides excellent adhesion to most common building materials without the need for primer.

This flexible, paintable sealant is rain-resistant shortly after application and delivers a smooth, durable finish. With low VOC emissions, it supports healthier indoor air quality while meeting green building standards.

Easy to apply and clean, Fill A Gap^® Exterior is the perfect solution for professional trades and DIY projects requiring reliable, long-lasting exterior sealing performance.

Geographic availability

Australia

Smart Advantages

Fast rain resistance

Paint over with water-based and synthetic paints

Easy to apply

Documents

SDS

Download the document

Technical Data

Appearance
White
Density
1.57 g/ml
Application Temperature
+5°C to +40°C
Temperature Resistance
-20°C to +75°C
Skin Time
Approx. 10 minutes @ 23°C / 50% RH
Cure Rate
2 mm per 24 hours @ 23°C / 50% RH

SUITABLE FOR

Sealing joints between:
Windowsills and frames (wood or metal)
Stairs, ceilings, and walls
Skirtings, aerated concrete, plasterboard, and limestone
Concrete and brickwork

Not suitable for PE, PP, PC, PMMA, PTFE, soft plastics, neoprene, or bituminous substrates, heavy driving rain or hail during curing

COMPATIBLE WITH

Concrete
Brick
Plasterboard
Aerated concrete
Limestone
Wood
Metal
Slightly damp surfaces (with proper preparation)

Related market & applications

Sealing & Bonding

Joint Sealing

FILL A GAP^® EXTERIOR

Smart Advantages

Related market & applications

Sealing & Bonding

Related products

5CLM^® SILICONE

6S NEUTRAL CURE SILICONE