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Protect Your Work


OSI® helps you protect your work with a powerful combination of proven sealant products and support services so you can stay at the top of your game.​

Siding Products & Services

We’ll be your trusted partner every step of the way. We’ll help you reduce callbacks and costs by putting a well-trained workforce in the field with quality products — leading to more satisfied homeowners, a better reputation, and a better business. A job done right.

  • osi quad max 9.5oz cartridge


    Sealant for window, door & siding applications

OSI 9200 color matches

Find Your Custom Color Match

With the broadest color sealant portfolio in the industry, you can expertly match OSI® QUAD MAX® to more major manufacturer siding and trim products than any other sealant.  

Related Articles

Get powerful insights and information that will keep you ahead of the competition.  OSI® delivers relevant articles, technical bulletins,  videos and much more.   We’re sharing what our expert professionals are observing and learning everyday on the jobsite and in the lab.

  • Fillet Beads Keep Mother Nature Cornered
  • Evolution of Home Building and Sealants
  • Technical Bulletin: Moisture and Delamination
  • Understanding How Moisture Can Impact Your Installation

Join the Construction Revolution!

OSI's Dealer Program offers top-notch performance, education & more.

Limited Warranty - on select James Hardie installs

Markeitng Support - To increase customer conversion

Training - ​ for proper sealant application

Install With Confidence – Get Ongoing Knowledge and Support From the Professionals at OSI®.​