Overview

This box of 12 HB42 Fusion Ultimate Sealant cartridges is designed for trade professionals who need a reliable stock of a next-generation hybrid polymer sealant on hand. Engineered to combine the smooth application and clean finish you'd expect from a silicone with the strength, flexibility and long-term durability of a modern polymer, HB42 Fusion delivers where standard silicones and acrylics tend to fall short.

Versatile enough for sanitary, construction, roofing, façade, automotive and marine work, it's also safe to use in food preparation areas and on surfaces that stay consistently damp. With strong anti-mould properties and UV resistance built for both indoor and outdoor use, it's a dependable choice for expansion joints, construction joints, and sealing around plastic, timber or metal frames.

• Box contains 12 cartridges - ready stock for trade or larger jobs
• Hybrid polymer formulation - silicone-smooth finish with polymer-grade strength
• Handles significant movement - accommodates up to ±20% joint movement without cracking
• Resists mould and UV damage - stays cleaner for longer in any environment
• Can be overpainted with waterbased paints once fully cured
• Broad temperature range - performs from -40°C to +100°C
• Bonds to a wide range of surfaces - plastic, timber, metal and more
• Built to last - 20+ year life expectancy when correctly applied

Preparation

• Ensure all surfaces are clean, dry and free from dust, grease, oil or standing water.
• Clean non-porous surfaces (e.g. aluminium) appropriately with a suitable solvent cleaner.
• Prime porous substrates if required - check compatibility on a test area first.
• Check joint dimensions: minimum 6mm x 6mm, maximum 20mm wide x 12mm deep.
• For deeper joints, insert a backer rod before application to control sealant depth and improve movement performance.
• Mask joint edges with tape for a clean, professional finish if desired.

Application

• Cut the cartridge nozzle to the desired bead size and load into a standard cartridge gun.
• Apply the sealant firmly and evenly into the joint, keeping the gun at a consistent angle.
• Tool the sealant within 10 minutes of application for the best finish (a smoothing tool or spatula dipped in soapy water works well).
• Remove masking tape immediately after tooling, before the surface skins over.
• Allow to skin for approximately 15–20 minutes (at 23°C / 50% RH) before disturbing the surface.
• If overpainting, use waterbased paints only, and allow the sealant to fully cure first.

Tip: Work in temperatures between +5°C and +35°C for optimal application and curing performance.

Aftercare & Storage

Aftercare & Curing

• Keep the joint free from movement, water contact and dust while curing.
• Cure rate is approximately 3mm per 24 hours - larger beads will take longer to fully cure through.
• Avoid submerging the sealed joint in water; HB42 Fusion is not designed for permanently submerged or aquarium use.
• Once fully cured, the sealant offers excellent long-term resistance to mould growth and UV exposure.

Clean Up

• Wipe away excess uncured sealant immediately with a dry cloth or paper towel.
• Use a suitable solvent (such as isopropyl alcohol) to remove uncured residue from tools and non-porous surfaces.
• Cured sealant can only be removed mechanically (e.g. scraping) - solvents will not dissolve it once fully vulcanised.
• Clean the cartridge nozzle and reseal or replace it for future use to prevent the tube curing in storage.

Storage

Store unopened cartridges in cool, dry conditions between 5°C and 25°C. Under these conditions, shelf life is 12 months. Keep away from direct sunlight and frost during storage and transport (frost resistance during transport is rated to -15°C).