Container of colloidal silica with colorful label on a white background

Colloidal Silica Marine Structural Bonding Filler

$25.00

Colloidal Silica Marine Structural Bonding Filler is an additive designed to enhance marine epoxy systems by creating a high-density filler that strengthens bonds and fills gaps. Compatible with both UltraClear FAST and SLOW Marine Epoxy, it is intended for structural bonding, gap filling, and filleting projects in marine environments.

Enhances structural bonding strength in marine epoxy applications
Creates a hard, dense filler to support strong joints
Compatible with UltraClear FAST and SLOW Marine Epoxy systems
Available in 1 Quart and 1/2 Gallon container sizes

Size: 1 Quart $25

1 Quart $25
1/2 Gallon $35

Product variants

Dense filler for marine epoxy

Choose Colloidal Silica for Stronger Bonds

Product Details

Marine Structural Bonding Filler

Brand: UltraClear Epoxy Category: Protective Coatings & Sealants Material: Colloidal silica additive compatible with UltraClear marine epoxy systems. Dimensions: Available in 1 Quart and 1/2 Gallon containers. Type: Protective Coatings & Sealants Design: Protective Coatings & Sealants Options: Size: 1 Quart $25, 1/2 Gallon $35 Variants: 1 Quart $25, 1/2 Gallon $35

What arrives

One Colloidal Silica Marine Structural Bonding Filler resin product in the selected size or kit option.

Size Options

1 Quart or 1/2 Gallon Containers

Mix colloidal silica into your marine epoxy system to create a thick filler paste for bonding, filling, or filleting. Confirm mix ratio, pour depth, temperature, working time, cure schedule, and safety precautions before mixing.

Select the container size that suits your project's scale

Compatible with UltraClear FAST and SLOW Marine Epoxy systems. Use with compatible pigments, molds, forms, wood, sealers, and topcoats only where the manufacturer allows.

Always follow the manufacturer's instructions and safety guidance.

Shipping & Returns

Fast Delivery and Flexible Returns

Shipping Details

Shipping rates and delivery estimates are shown at checkout. Most partner-brand orders ship in 1-5 business days when inventory is available, but timing can vary by supplier, destination, item type, and carrier. Multi-brand orders may arrive in separate packages.

Returns & Warranty

Return requests are accepted within 30 days of delivery. Damaged, defective, incorrect, or missing items are fully supported; contact Resin Society first and we will coordinate directly with the brand. Change-of-mind returns are reviewed according to the supplier's return policy and item condition.

Workboat calm

When joints meet and hold

Strength, not show

Gaps at a seam can steal confidence from a build. Colloidal Silica Marine Structural Bonding Filler turns that uneasy edge into a dense, supportive fill for fillets and bonds. Mixed into a marine epoxy system, it brings body where you need it most—at corners, laps, and joins that take real load.

Solid where it counts

Boats, benches, and brightwork live in motion—swells, footsteps, the weight of tools. A high‑density filler helps the epoxy grip and stay put, shaping clean fillets and tight bonds that read as intentional. The result is work that feels composed in the hand and trustworthy on the water.

For the hands that build

Makers and repairers who want a dense, supportive filler for structural bonding, gap filling, and filleting with UltraClear FAST or SLOW Marine Epoxy.

In the shop

Blend into UltraClear FAST or SLOW Marine Epoxy to thicken for structural bonding, gap filling, or forming smooth fillets along a joint.

Epoxy projects
Wood and resin work
Pour planning
Shop use

Supplier Insight

UltraClear Epoxy

UltraClear Epoxy began with a simple mission: craft the clearest, toughest, and safest epoxy resin available. Engineered for flawless clarity and long-term strength, their formulations—American made in Murfreesboro, TN—are VOC-free and odorless so makers can work confidently indoors in homes, schools, and studios. UltraClear’s deep‑pour systems and coatings have become a favorite for bar tops, table tops, countertops, and river tables, and the line supports casting, pigments, additives, and pour supplies that practical builders rely on. With over a million customers and widespread maker endorsement, UltraClear is designed for artists and woodworkers who need predictable clarity, reliable strength, and low emissions for interior projects.

Explore UltraClear Epoxy

Common Questions

Colloidal Silica Marine Structural Bonding Filler FAQs

What does Colloidal Silica do in a marine epoxy system?

It thickens the epoxy into a hard, dense filler that supports strong structural bonding, fills gaps, and forms filleted joints.

Is it compatible with UltraClear FAST and SLOW Marine Epoxy?

Yes, it works with both UltraClear FAST and SLOW Marine Epoxy.

When should I choose this over other fillers?

Use it when you need a high‑density mix for strength—such as structural bonds, gap filling, and filleting along stress points.

Can I use it to create smooth fillets along interior corners?

Yes. Mixed into marine epoxy, it builds body for shaping clean, supportive fillets.

What size is the container shown?

Compare the listed Colloidal silica additive compatible with UltraClear marine epoxy systems, Available in 1 Quart and 1/2 Gallon containers, product photos, quantity, care notes, and delivery expectations before checkout.