CRL 3/4" Closed Cell Backer Rod - 100' Roll Finish:Gray and many plastics

and many plastics

and tilt-up panels

They hold securely between the cartridge and the end of the caulking gun

Limitations

CRL 3/4" Closed Cell Backer Rod - 100' Roll Finish:Gray and many plasticsAllows Easy Control of Sealant Application Thickness Won't Adhere to Sealants; No Bond Breaker Needed Compatible with All Cold Applied Sealants CRL Closed Cell Backer Rod is a round, flexible, closed cell polyethylene foam with an exterior "skin" used as a backing and thickness control device for elastomeric and other cold applied sealants. The Backer Rod becomes an integral part of the joint into which it is installed, and therefore is available in a