FLEX 40 Hot Melt Construction Adhesive

FLEX 40 combines the speed and elasticity of hot melt glue sticks with the strength and versatility of construction adhesives. It is ideal for a range of applications including carpet tack strips to concrete, floor transition strips, wood moldings and trim, vinyl cove and stair nosings, ceramic and glass tile repair, and more. FLEX 40 offers 40 seconds of open (working) time, instant tack, and a full strength bond in 5 minutes or less.

  • Instant tack firmly grabs materials
  • 40 seconds open (working) time
  • Full strength bond in 5 minutes or less
  • FLEX Technology allows expansion and contraction over time without compromising strength
  • Bonds to a wide variety of porous and non-porous materials


FLEX Hot Melt Construction Adhesive

FLEX is ideal for professional remodelers and floor installers looking for an adhesive system that provides strength, versatility and speed. It combines the strength of construction adhesives with the speed and flexibility of hot melt.

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  • Installation
  • Technical Docs
  • Purchase FM Products
FLEX 40 SKU Selection Guide
Carpet tack strips and vinyl Plastic, ceramic tile, glass, metal and other materials 18 sticks 90 lin ft FMFLEX40


  1. The HB220 tool temperature is preset. Turn it on, and allow 5 minutes for the tool to reach operating temperature.
  2. Once the HB220 tool is hot, load FLEX40 into the chamber. Simply pull the trigger to apply adhesive.

Store FLEX in a cool, dry area and away from direct sunlight. Wear safety glasses while operating heated glue gun and avoid skin contact with hot material.

ICC-ES Report, ESR 1078

The ICC-ES Evaluation Report demonstrates to the installer and code official that our LOK fasteners comply with the most current building codes. This report also provides the engineer with critical values needed to design safe installations. Reports from ICC-ES are the most recognized reports used by code officials across the U.S. This document can be shared with code officials, engineers, architects and specifiers who may have questions regarding proper use or code compliance of LOK fasteners.

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