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White Lap Caulk
Available in 10.5 oz. tubes

Product Information:

Our TPO lap caulk is available in 10.5 oz tubes in both black or white for use in single ply membrane applications such as EPDM or TPO. Standard caulk gun is required for application. Product should not be screed or smoothed after application. This caulk is meant to prevent water infiltration into seams and overlaps prior to the adhesive setting up. Usually 24-48 hours depending on temperature and humidity.

Application Instructions:

TPO lap caulk is used when applying splice and/ or bonding adhesives where membrane is overlapped. Prevents initial moisture infiltration before the adhesives are set. Standard caulk gun required for use. Once plastic top is cut you must puncture the tube through the plastic top with a screw driver or long screw or nail to begin application. Do not screed or smooth caulk once applied. All seams that were glued or installed should be caulked at the end of each day.


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Available in 10.5 oz. fiber caulk tubes or 5 gallon pails.

Seal Trust™ Water Cut-Off Mastic is a gray solvent based caulk designed to be used under the membrane to prevent water infiltration. Meets OTC VOC requirements.

Physical Properties:

Color: Gray
Viscosity (eps): 40# .104= 15-20 sec./20 gms.
Sievers Rheometer Density (#/GAL.): 11.0#
{caa914c204b1119fb3ddf612b08b76802b03c1f9b8e71b690c389a73edd07169} Solids: 86
Flash Point (F): 14 F TCC
Base: Synthetic elastomers, resin(s) and filler(s)
Solvent System: Aliphatic Clean-up
Solvent: Mineral spirits, VMP naptha, kerosene
Storage: May be stored outside if protected from water.
Packaging: 5 gallon pails, 10.5 oz. fiber caulk tubes (10 or 25 tubes/ctn)