West System Additive Filler

Epoxy Thickening & Fairing Additive for Structural Applications

West System Additive Fillers 410–417 are purpose-made epoxy additives designed to thicken, reinforce or improve sanding characteristics of mixed epoxy for professional bonding and fairing work.

Added to properly mixed West System epoxy resin and hardener, these fillers allow you to control viscosity for specific jobs such as gap filling, filleting, fairing and high-strength bonding. Different grades within the 410–417 range are commonly selected based on whether the priority is easy sanding, smooth fairing, improved gap-filling stability or higher strength reinforcement for structural joints.

Ideal for marine maintenance, boat building, timber repairs and composite fabrication, West System fillers reduce sagging on vertical surfaces, improve shaping control and help produce cleaner, more consistent finishes. Compared to using unthickened epoxy, the correct filler selection improves application accuracy, reduces run-off and supports better surface preparation for coating or painting.

Features & Benefits

Key Features

• Range of epoxy fillers (410–417) for different outcomes
• Designed to be added to mixed epoxy resin and hardener
• Controls viscosity for fairing, filleting and bonding
• Helps prevent sagging on vertical or overhead applications
• Supports smoother shaping and finishing workflows

Key Benefits

• Improves control and consistency during application
• Creates fairing compounds that shape and sand cleanly
• Produces stable fillets and gap-filling mixes
• Helps achieve better surface preparation before topcoats
• Suitable for marine, timber and composite repair work
  
  

Technical Specs

• Product Type: Epoxy additive fillers
• Range: 410–417
• Compatibility: West System epoxy resin systems
• Function: Thickening, fairing, filleting, reinforcing (varies by grade)
• Application: Add to mixed epoxy resin and hardener to desired consistency
  
  

Key Applications

• Marine fairing and surface shaping
• Timber gap filling and bonding
• Filleting joints prior to fibreglass taping
• Composite repairs and laminate preparation
• Workshop fabrication and structural epoxy work
  
  

West System Additive Filler 410–417 FAQs

Q1: What are West System Additive Fillers 410–417 used for?
A: They are used to modify mixed epoxy for fairing, filleting, gap filling and bonding applications.

Q2: Do I add these fillers to resin only?
A: No, add filler after the resin and hardener are properly mixed, then adjust to the required consistency.

Q3: Are all 410–417 fillers the same?
A: No, each grade is designed for different outcomes such as easier sanding, smoother fairing or stronger reinforcement.

Q4: Will these prevent epoxy from running on vertical surfaces?
A: Yes, thickening epoxy helps reduce sagging and improves control on vertical or overhead work.

Q5: Is this range suitable for marine repairs?
A: Yes, these fillers are widely used in boat building and marine maintenance for fairing and bonded joints.