SeamStitch Butyl Caulk


SeamStitch Butyl Caulk is a white, solvent-based brush grade butyl rubber caulk.


Seals sheet metal fasteners, seams, laps and flashings prior to the application of elastomeric roof coatings.


  • Provides a seamless, elastic and durable membrane.
  • Contains fungicides and mildewcides.
  • Superior adhesion to various substrates.
  • Reflective roof coating helps reduce cooling costs, prevents UV-degradation and premature roof failure.
  • Vapor barrier coating withstands ponding conditions in low slope roofs.


  • 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: polyester brush, long nap roller, spreader or 3000psi, 3gpm airless sprayer with a .031 tip.
  • Do not leave coating in spray guns, hoses and pumps for prolonged periods.
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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 Butyl Caulk

Technical Data

Property Value Test Method
Clean UpXylene
Packaging5 gallon pail
Density7.6 ± 0.2 pounds/gallon
Elongation500% ±50%ASTM D-412
Flash Point68°F
Hardness55 Shore A
Impact Resistanceexceeds 160b in/lb.
Permeability0.005 perms/inASTM E-96
Tensile Strength500 ±50 psiASTM D-412
Shelf Life12 months @ 40°- 90° F
Service Temperature-50º TO 200º F
Solids by Volume56 ±3%ASTM D-2697
Impact Resistanceexceeds 160b in/lb.
Viscosity65,000 ± 15,000 cP
VOC461 grams/liter