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  • Hot or cold applications
  • Flexible at -20ºF and non-sagging up to 350ºF
  • Self adhesive and easy to apply
  • Non-staining and non-hardening
  • Water and vapor proof with no odor - white in color
  • Non corrosive to metals
  • Seal duct work and other HVACR jobs


This compound is formulated and manufactured for use in many sealing, insulating, and general maintenance applications. It has excellent adhesion capability and is non-staining, non-hardening, and unaffected by wide variations in temperature. Thumb-Tite is packaged in 2 lb. boxes, each box contains two one pound bars.

For Refrigeration
  • Seal out air and moisture
  • Seal around tube entries
  • Seal under latch plates
  • Seal under hinges
  • Seal over screw head

For Air Conditioning

  • Seal window openings
  • Seal air ducts
  • Seal adaptors and extensions
  • Seal air, dust, and moisture
Packaging Size Part Number Additional Info
2 lb. Box 4216-92


This product must be used in accordance to the following directions by HVACR professionals only.

Can be easily worked by hand into any desired shape. Simply press into place. Adheres to most clean, dry surfaces, including metal, wood, glass, masonry, plastic and rubber.

Product Information:

Literature Downloads

Download the product bulletin and other relevant literature here.


Download a low resolution file of the product label here.

Product Safety

RTK Information

2611 Schuetz Rd. St. Louis, MO 63043
  • Telephone: 800.554.5499
  • Email:
  • Hours: Mon–Fri: 8:00am - 5:00pm (Central Time)

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