OSI® GS121 Gutter & Seam Sealant

A gutter & seam sealant designed especially for sealing aluminum, galvanized and vinyl clad gutters and downspouts.  

Recommended For

GS121 is designed for sealing around aluminum, galvanized and vinyl gutters and downspouts, sealing seam, joints and cracks in gutter troughs, and for use on sheet metal, air conditioning and heating ducts and ventilators.

For Best Results

Do not tool, feather or smear sealant.   Not recommended for: interior use in occupied structures, as an epansion joint control sealant, or for use on copper.  For joints deeper than 3/8" (9.5 mm), a backing material should be used.

Features

• Permanently Flexible, Water Resisant Seal
• Seals Most Common Gutter and Downspout Materials
• Expands and Contracts with Temperature Changes
• Cures to a Tough Rubbery Gasket

Sizes

• 10 fl oz (295 ml)
• 5 oz (148 ml)

Colors

• White 
• Clear 
• Aluminum

Clean Up

• Mineral Spirits

Downloads

Technical Data Sheet

MSDS-10 OZ WHITE

MSDS-10 OZ ALUMINIUM

MSDS-10.2 OZ WHITE

MSDS-10.2 OZ ALUMINIUM