AVAILABLE IN MORE THAN 140 INDUSTRY COLORS.                                                                ADVANCED HYBRID POLYMER, ADHESIVE AND SEALANT, LOW VOC

DUO-SIL ULTRA® is specifically designed to meet the needs of the professional contractor. It is a superior, all-purpose adhesive and sealant combining enhanced ease of application with long-term performance. Duo-Sil Ultra® can be applied form 0° to 140°F, on wet, damp, or dry surfaces and is ready to paint in one hour after application. Duo-Sil Ultra® is formulated to withstand the harshest weather conditions from extreme cold to driving rain to hot and humid conditions. It will never shrink, crack, or peel and has a low VOC formulation containing no isocyanates or solvents. View our color cross reference spreadsheet to make color matching a snap on the job.

Application Standards

DUO-SIL ULTRA® Advanced Hybrid Polymer meets or exceeds the requirements of ASTM C920, Class 50 and AAMA 803.3-10

Basic Uses

Duo-Sil Ultra®  can be used for both interior and exterior applications.  It is ideal for use with fiber cement siding, vinyl siding, windows, doors, aluminum, wood, mortar, brick and more. 


  • Enhanced ease of application
  • Two-Piece plastic cartridge will not deteriorate when exposed to the elements
  • 4” detachable nozzle for repeated use and increased efficiency
  • Can be applied in extreme temperature ranges 0°F to 140°F
  • Superior adhesion and sealing
  • Waterproof
  • LOW VOC formula
  • Can be applied to dry, damp or wet surfaces
  • No water washout
  • No odor
  • Paintable in 1 hour
  • Does not shrink or crack or peel

Typical Properties

Application Temperature
0°F to 140°F
Skinning Time
15 Minutes
Cure Time
24/48 hours
Hardness Shore A
Temperature Resistance
-75°F to 350°F
Specific Gravity
Acrylic or Latex paints
Application Temperature
40°F to 90°F
Mineral Spirits
Shelf Life
12 months
40°F to 80°F
Please contact Siroflex® Inc. Greenville, SC prior to writing specifications on this product.


Duo-Sil Ultra® is available in 9.5 fl oz.(280 ml) plastic cartridges with detachable 4” nozzle


Available in white and over 140 industry colors.


  • Not recommended for application on Teflon, polypropylene or polyethylene surfaces.
  • Not for use on underwater application or for expansion joints.
    Some alkyd paints may not be compatible with Duo-Sil Ultra®

Clean up

Clean up with mineral spirits.


Available through your local Siroflex® Inc. distributor located strategically throughout the U.S.  Call 1-800-359-6398 or email cservice@siroflexinc.com to find your local distributor.

Notice to Purchaser

Siroflex® Inc. warrants its products to conform to Siroflex® Inc. published specifications. The user shall determine the suitability of the product to their particular application. the foregoing warranty is in lieu of all other warranties expressed or implied, including those of the merchantability or fitness for any purpose not expressly set forth herein. Manufacturer’s and seller’s liability for damage hereunder shall not exceed the purchase value of the goods used. IN NO EVENT SHALL MANUFACTURER OR SELLER BE RESPONSIBLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR IN CONNECTION WITH THE USE OF THIS PRODUCT BY BUYER, BUYER’S USER, OR ANY OTHER PERSON. Notification of claim must be sent in writing to Siroflex® Inc. The notice should contain a statement as to how the product failed to meet our warranty, the proof of purchase and the amount of refund claimed.


Keep out of reach of children.
Do not take internally. Contains propylene glycol and mineral spirits.