Superior Gold Knife GV-5 Knife Grade Stone Adhesive

Superior Gold Knife Grade Adhesive — Professional Stone Bonding in a Quart Format

The Superior Gold Knife Grade Adhesive is a professional-grade, polyester-based stone bonding compound engineered for fabricators, countertop installers, and stone contractors who demand precision and reliability on every job. Formulated with a thick, non-sag consistency, this knife-grade adhesive is purpose-built for vertical seams, edge laminations, and gap-filling applications where runny adhesives would fail. It is compatible with granite, marble, quartz, travertine, limestone, and engineered stone surfaces, making it a versatile solution across a wide range of natural and manufactured stone work.

Unlike general-purpose construction adhesives, the Superior Gold knife-grade formula delivers superior color clarity, extended open time for positioning adjustments, and a bond strength that resists the mechanical stresses of daily countertop and stone installation environments. Its knife-grade viscosity means the adhesive stays exactly where it is applied, eliminating waste and rework caused by slump or drip.

Key Features & Benefits

Knife-Grade Non-Sag Viscosity

The thick, paste-like consistency of this adhesive prevents it from running or slumping on vertical surfaces and overhangs. For fabricators working on edge laminations or wall-mounted stone panels, this means cleaner joints, less cleanup, and greater control over bead placement without the need for taping or damming.

High Bond Strength

Formulated to achieve a strong, durable cure that withstands the mechanical loads typical in countertop installations, including impact, flexion, and thermal cycling. A reliable bond reduces callbacks and ensures long-term joint integrity in residential and commercial settings.

Excellent Color Clarity

Superior Gold is engineered to cure to a near-transparent or tintable finish, allowing fabricators to blend the adhesive seamlessly with the stone's natural veining and coloration. This is critical when working with translucent or light-colored stones where adhesive visibility in the joint would be unacceptable to clients.

Compatible with Multiple Stone Types

This adhesive bonds effectively across granite, marble, quartz, travertine, limestone, onyx, and engineered stone surfaces. A single product that works across your full stone inventory reduces the complexity of your supply chain and ensures consistent results regardless of material.

Quart Format for Job Site Efficiency

The quart size provides enough volume for multiple countertop installations or a full day of lamination work without constant restocking. It is a practical format for shops and job sites that need a reliable supply on hand without committing to bulk quantities.

Polyester-Based Formulation

Polyester adhesives offer rapid cure times and excellent compatibility with the porous and semi-porous surfaces common in natural stone work. This chemistry ensures the adhesive penetrates surface irregularities for a mechanical bond that complements the chemical adhesion.

Common Applications

Countertop Seam Bonding

Joins two stone slabs at mitered or butt seams during countertop fabrication, producing a tight, strong joint that resists opening under load or temperature change.

Edge Lamination

Bonds eased, beveled, or profiled edge pieces to countertop slabs to build thickness or create decorative profiles. The knife-grade viscosity prevents adhesive from running off vertical surfaces during cure.

Crack and Void Filling

Fills natural fissures, pits, and voids in stone slabs prior to or during fabrication, stabilizing weak areas and improving the surface for polishing and finishing.

Backsplash and Wall Stone Installation

Secures stone tiles or panels to vertical wall substrates where non-sag performance is essential to prevent movement before the adhesive sets.

Sink Cutout Reinforcement

Applied along the underside of sink cutouts to reinforce the perimeter and reduce the risk of cracking during undermount sink installation or in service.

Repair and Restoration Work

Used by restoration contractors to re-bond broken or chipped stone sections, fill spalls, and stabilize damaged areas on existing countertops, floors, and monuments.

Compatible Materials

• Granite
• Marble
• Engineered Quartz (e.g., Silestone, Caesarstone, Cambria)
• Travertine
• Limestone
• Onyx
• Slate
• Porcelain and Ceramic Tile (check substrate compatibility)
• Solid Surface Materials
• Concrete Stone

Available Sizes

Technical Specifications

Frequently Asked Questions

Q: What is the difference between knife-grade and flowing-grade stone adhesive?
A: Knife-grade adhesives have a thick, paste-like consistency that holds its position after application without slumping. Flowing-grade adhesives are thinner and self-level into tight seams. Knife grade is preferred for vertical surfaces, edge laminations, and void filling where the adhesive must stay in place during cure.

Q: Can this adhesive be tinted to match my stone?
A: Yes. Polyester stone adhesives like Superior Gold are designed to accept standard stone adhesive colorants or pigment pastes. Mix colorant thoroughly before application to achieve a blend that matches your stone's background color and minimizes joint visibility.

Q: What hardener ratio should I use with this adhesive?
A: Polyester stone adhesives are typically catalyzed with a MEKP (methyl ethyl ketone peroxide) hardener. Refer to the specific mixing ratio printed on the product label or technical data sheet, as ratios affect working time and cure speed. Verify the current label instructions upon receipt.

Q: How long is the working time after mixing with hardener?
A: Working time varies based on ambient temperature, hardener percentage, and product batch. In standard shop conditions (65–75°F), most knife-grade polyester adhesives provide 5–15 minutes of working time. Higher temperatures or excess hardener will shorten working time significantly.

Q: Is this adhesive appropriate for outdoor stone applications?
A: Polyester adhesives offer moderate UV and moisture resistance but are primarily engineered for interior fabrication. For prolonged outdoor exposure or submerged applications, consult the product technical data sheet or consider an epoxy-based stone adhesive rated for exterior use.

Q: How should I store unused adhesive to maximize shelf life?
A: Store in a cool, dry location away from direct sunlight and heat sources. Keep the container tightly sealed to prevent skinning and premature gellation. Do not store near MEKP hardener. Check the manufacturer's recommended shelf life on the container label.