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7/8 in x 850 ft Master Builders MasterSeal 921 - Gray
7/8 in x 850 ft Master Builders MasterSeal 921 - Gray
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7/8 in x 850 ft Master Builders MasterSeal 921 - Gray

Description
Description

MaterSeal 921 is a reticulated closed-cell polyethylene foam joint-filler and backing for sealants. It compresses easily to accommodate joints of varying widths.

Features
  • Nongassing when punctured to eliminate bubbling of sealant
  • Reticulated closed-cell polyethylene foam for low moisture absorption
  • Nonimpregnated, nonstaining, and nonbleeding, will not discolor sealants or substrates
  • Highly resilient to conform to irregular joints; installs easily and quickly
  • Nonadhering to sealants, requiring no additional bondbreaker
Code: BSF921-78

For California Residents:

WARNING:Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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