Weld-On (SciGrip) 45 Tan Thick Non-Sag MMA Adhesive for Primer-Less Bonding of Aluminum, Metals, Plastics and Acrylics - 5-6 Minute Working Time - 50mL and 490mL 4:1 Mix Ratio

Weld-On 45: The Ultimate Structural Adhesive for High-Impact Bonding

Strength. Versatility. Durability. Meet the "structural workhorse" of the industrial world. Weld-On 45 is a high-strength, two-component methacrylate adhesive designed for the toughest bonding jobs where failure is not an option. Whether you are fabricating large-scale signage, assembling metal frameworks, or joining dissimilar materials that refuse to stick, Weld-On 45 delivers a permanent, high-impact bond that often rivals the strength of the substrates themselves. Formulated as a thick, non-sagging paste, it bridges gaps and withstands extreme weather, making it the go-to choice for professionals who need a bond that lasts a lifetime.

Weld-On Scigrip 45 is a high-performance, two-component, thixotropic (thickened) Methyl Methacrylate (MMA) structural adhesive designed for the structural bonding of metals, plastics, and composites without the need for external primers. Its non-sag formulation makes it ideal for vertical or overhead applications where runny adhesives would drip. Formulated with a 4:1 mix ratio and a 5-6 minute working time, it offers high impact strength, excellent fatigue resistance, and durability in harsh environments, making it a go-to choice for the sign, marine, and transportation industries.

Pro Tip: Because Weld-On 45 cures to an opaque tan color, it is best used for structural joints where the adhesive line is not visible. For visible joints requiring optical clarity, consider its sister product, Weld-On 46C.

Key Features & Specifications
Engineered for speed and reliability, Weld-On 45 simplifies complex assembly with a forgiving working time and a rapid fixture speed.

• Mix Ratio: 4:1 (Requires 4:1 dispensing gun & plunger)
• Working Time: 5 – 6 Minutes (at 73°F)
• Fixture Time: ~15 Minutes (Time to handle parts)
• Full Cure: 24 Hours
• Adhesive Color: Tan / Off-White (Opaque)
• Viscosity: ~500,000 cps (Thick Paste)
• Tensile Strength: ~2,500+ PSI (varies by substrate)
• Temperature Range: -20°F to 200°F (-29°C to 93°C)

Unique Capabilities

• Structural Gap Filling: Unlike thin glues that run, this high-viscosity paste fills large, irregular gaps between uneven surfaces, creating a solid structural bridge.

• Dissimilar Material Bonding: Specifically formulated to bond "hard-to-stick" combinations, such as metal-to-plastic or composite-to-wood, without compromising integrity.

• Extreme Environmental Resistance: Fully weather-resistant and waterproof. It resists corrosion, moisture, salt spray, and UV exposure, making it ideal for outdoor installations.

• High Impact & Fatigue Resistance: The cured bond retains a slight elasticity, allowing it to absorb shock, vibration, and thermal expansion/contraction without cracking.

Compatible Surfaces
Weld-On 45 is a "primer-less" adhesive for most metals, meaning it bonds aggressively with minimal surface preparation.

Metals:

• Aluminum (Raw & Anodized)
• Cold Rolled Steel (CRS)
• Stainless Steel
• Galvanized Steel
• Brass & Copper

Plastics & Composites:

• PVC & Vinyl
• Polycarbonate
• Acrylics (PMMA)
• ABS
• Fiberglass (FRP)
• PETG

Other Surfaces:

• Wood & Cellulosics
• Concrete, Brick, & Masonry

Trusted By Industries
From sign shops to shipyards, Weld-On 45 is the industry standard for:

• Sign Assembly: Structural bonding of large channel letters, cans, and frames where the bond line is hidden.
• Transportation: Bonding panels and brackets in buses, trucks, and rail cars.
• Marine Construction: Seaming and joining in boat manufacturing due to its superior moisture resistance.
• General Fabrication: Heavy-duty repair and assembly of metal enclosures, displays, and architectural features.

Compliance & Certifications

• UL 746C certified for aluminum and fiberglass

• VOC content below 250 g/L

• Complies with EPA air quality requirements

• Manufactured under IPS quality assurance program

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