SeamStitch Silicone Caulk


SeamStitch Silicone Caulk is a solvent-based, single component, moisture cure, high solids, silicone caulk.


Used to seal around pipe boots, seams, curbs, flashing, penetrations and fasteners. Useful for spot repairs on our silicone roof coating system.


  • Breathable membrane has exceptional weathering characteristics, prevents moisture entrapment and premature roof failure.
  • Long term durability compared to acrylic caulks.
  • Not affected by ponding water.
  • May be used for potable rainwater catchment applications.


  • Ready to use. Thinning is not necessary. Mix well before using.
  • Roof must be clean, dry and free of any oil, grease, dirt or loosely adhered coating. Bare surfaces must be prepared and checked for compatibility.
  • Follow our roof restoration procedures and always perform an adhesion test.
  • Equipment: putty knife, bulk loader, sausage gun.
Could not load Commerce. Please try again later.

Warning: This product contains solvents. Keep away from open flame, heat or sparks. Pumping equipment should be grounded to avoid accidental ignition due to static sparks. Use only in ventilated areas and provide mechanical ventilation in enclosed spaces. Avoid breathing vapor or mist. Approved (MESA/NIOSH) chemical respirator and protective clothing must be used when exposure can exceed recommended PEL. Fresh air hose masks required for interior applications. Care must be taken to prevent rooftop HVAC from introducing solvent vapor into interior areas. Lexis Coatings must be completely dry before exposing to water or foot traffic. Keep Lexis Coatings containers covered when not in use. Dispose of all containers in accordance with state and local environmental regulations. Keep away from children. If ingested, DO NOT induce vomiting. Call physician immediately.

Product information contained herein are presented in good faith and believed to be reliable. They do not constitute part of our terms and conditions of sale. It is also not a guarantee, either expressed or implied, that the data are correct or that products described are merchantable or fit for a particular purpose as methods of use are beyond our control. Customer should determine the suitability of our materials and installation recommendations before usage. Manufacturer’s sole responsibility shall be to replace that portion of any product that proved to be defective.

SeamStitch Silicone Caulk

Technical Data

Property Value Test Method
Application Temperature50°F (and rising) - 95°F. Lower temperature and humidity will effect cure.
Clean UpWhite, Medium Gray or Dark Gray
Cure Time12 - 18 hours.
Tack Free: 1-2hours
Density10.7 lb/gallon
Elongation275%ASTM D-412
Flash Point>200F°ASTM D-93
HMISHealth 2, Flammability 2, Reactivity 0, Protection X
Hardness50±5 (Shore A)ASTM D-2240
Packaging2 gallon pails
Permeability4.2 perms.ASTM E-96
Tensile Strength130 psiASTM D-412
ThinnerNot Recommended
Shelf Life12 months @ 50° to 85° F
Service Temperature-25° To 175° F
Solids by Volume95% ± 3 ASTM D-2697
VOC<50 grams/literEPA Method 24
Viscosity150,000 cps