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Reverse Channel Letter Bonding System

Our Reverse Channel Letter Bonding System lets sign fabricators replace MIG/TIG welding and tedious grinding with a fast, UL-recognized structural adhesive (LORD® Signlok™ 406) and a high-performance acrylic hot-melt stick (Surebonder 925R10) applied with the CCH220 heavy-duty glue gun. The result: stronger bonds, cleaner aesthetics, and dramatic labor savings for halo-lit and back-lit letters.

Why Choose Adhesive Bonding Over Welding?

  • No rust, sparks, or heat distortion—maintain crisp letter geometry.

  • Skip the re-grind: zero weld seams to sand or fill.

  • Use lighter 22-24 ga. aluminum for material cost savings.

  • Bond dissimilar substrates—aluminum, stainless, ACM, polycarbonate, ABS.

  • Faster throughput: hot-melt tacks in 60 s; structural adhesive reaches handling strength in ~15 min.

  • Cleaner halo—no read-through or light leaks.

System Components

Component Description
LORD Signlok 406 Two-part acrylic; 6–10 min work time; UL 746C recognized; bonds untreated metals & plastics.
Surebonder 925R10 60-second open-time acrylic hot-melt stick for quick tacking and fixturing.
CCH220 Hot-Melt Gun 220 W industrial glue gun matched to 7/16″ sticks for precise bead control.

Key Features & Benefits

  • Rapid fixture—letters move from bench to paint in under 20 minutes.

  • Glass-bead-controlled bondline for uniform spacing and optimal light diffusion.

  • Excellent peel & impact strength for long-term exterior durability.

  • 100 % solids; no VOCs or solvent cleanup.

  • Compatible with powder-coat bake cycles up to 149 °C (300 °F).

Typical Applications

  • Reverse halo letters
  • Dual-lit letters
  • Stainless or aluminum logotypes
  • Architectural tenant signage
  • Monument signs
  • Channel letter returns & backs

Alternative Fabrication Methods Compared

Method Pros Cons
Welding (MIG/TIG) High strength Heat warp, grind marks, skilled labor, oxide cleanup
Mechanical fasteners / rivets Low equipment cost Drilling, visible heads, stress concentrations
3M VHB™ tape Clean appearance, instant handling Limited gap fill, surface prep critical, lower peel on small flanges
Structural adhesive + hot-melt (our system) High strength, hidden bond, minimal prep Short fixture time required before load

Technical Specs

Property Signlok 406 Surebonder 925R10
Work/Open Time 6–10 min 60 s
Handling Strength 12–17 min @ 24 °C ~1 min
Service Temperature –40 °F – 300 °F –20 °F – 200 °F
Lap-Shear (Al) 2,000 psi n/a (tack aid)
Color Tan (cures green) Clear
Mix Ratio 2 : 1 cartridge —

Compliance & Certifications

  • Signlok 406: UL 746C Recognized, RoHS compliant

  • Surebonder 925R10: ASTM D-4236 compliant

Compatible Substrates

Brushed or painted aluminum, stainless steel, ACM, galvanized sheet, polycarbonate, ABS, acrylic, powder-coated parts.

Packaging & Ordering

  • LORD Signlok 406 – 225 mL cartridges

  • Surebonder 925R10 – 25 lb case (= 450 sticks)

  • CCH220 Gun – 1 ea with standard 3 mm nozzle

Resources

  • Signlok 406 Technical Data Sheet

  • 925R10 Safety Data Sheet

Ready to ditch welding for good?

Call our sign-industry team at 800-220-1966 or request a quote online to get volume pricing, cartridge mixers, and application tips.

Our Reverse Channel Letter Bonding System lets sign fabricators replace MIG/TIG welding and tedious grinding with a fast, UL-recognized structural adhesive (LORD® Signlok™ 406) and a high-performance acrylic hot-melt stick (Surebonder 925R10) applied with the CCH220 heavy-duty glue gun. The result: stronger bonds, cleaner aesthetics, and dramatic labor savings for halo-lit and back-lit letters.

Why Choose Adhesive Bonding Over Welding?

  • No rust, sparks, or heat distortion—maintain crisp letter geometry.

  • Skip the re-grind: zero weld seams to sand or fill.

  • Use lighter 22-24 ga. aluminum for material cost savings.

  • Bond dissimilar substrates—aluminum, stainless, ACM, polycarbonate, ABS.

  • Faster throughput: hot-melt tacks in 60 s; structural adhesive reaches handling strength in ~15 min.

  • Cleaner halo—no read-through or light leaks.

System Components

Component Description
LORD Signlok 406 Two-part acrylic; 6–10 min work time; UL 746C recognized; bonds untreated metals & plastics.
Surebonder 925R10 60-second open-time acrylic hot-melt stick for quick tacking and fixturing.
CCH220 Hot-Melt Gun 220 W industrial glue gun matched to 7/16″ sticks for precise bead control.

Key Features & Benefits

  • Rapid fixture—letters move from bench to paint in under 20 minutes.

  • Glass-bead-controlled bondline for uniform spacing and optimal light diffusion.

  • Excellent peel & impact strength for long-term exterior durability.

  • 100 % solids; no VOCs or solvent cleanup.

  • Compatible with powder-coat bake cycles up to 149 °C (300 °F).

Typical Applications

  • Reverse halo letters
  • Dual-lit letters
  • Stainless or aluminum logotypes
  • Architectural tenant signage
  • Monument signs
  • Channel letter returns & backs

Alternative Fabrication Methods Compared

Method Pros Cons
Welding (MIG/TIG) High strength Heat warp, grind marks, skilled labor, oxide cleanup
Mechanical fasteners / rivets Low equipment cost Drilling, visible heads, stress concentrations
3M VHB™ tape Clean appearance, instant handling Limited gap fill, surface prep critical, lower peel on small flanges
Structural adhesive + hot-melt (our system) High strength, hidden bond, minimal prep Short fixture time required before load

Technical Specs

Property Signlok 406 Surebonder 925R10
Work/Open Time 6–10 min 60 s
Handling Strength 12–17 min @ 24 °C ~1 min
Service Temperature –40 °F – 300 °F –20 °F – 200 °F
Lap-Shear (Al) 2,000 psi n/a (tack aid)
Color Tan (cures green) Clear
Mix Ratio 2 : 1 cartridge —

Compliance & Certifications

  • Signlok 406: UL 746C Recognized, RoHS compliant

  • Surebonder 925R10: ASTM D-4236 compliant

Compatible Substrates

Brushed or painted aluminum, stainless steel, ACM, galvanized sheet, polycarbonate, ABS, acrylic, powder-coated parts.

Packaging & Ordering

  • LORD Signlok 406 – 225 mL cartridges

  • Surebonder 925R10 – 25 lb case (= 450 sticks)

  • CCH220 Gun – 1 ea with standard 3 mm nozzle

Resources

  • Signlok 406 Technical Data Sheet

  • 925R10 Safety Data Sheet

Ready to ditch welding for good?

Call our sign-industry team at 800-220-1966 or request a quote online to get volume pricing, cartridge mixers, and application tips.

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