CRL 1/2" x 1-1/8" x 4" Silicone Rubber Setting Blocks Self-Oiling Cutters The black color helps to

The black color helps to disguise the backer rod in certain joint applications

they seal out air and dirt to preserve the quality of the remainder of the sealant

CRL professional quality Silicone Sealant is available for small jobs or over-the-counter retail sales

usually after two hours of application for latex paint or 24 hours if using an oil-based paint

CRL 1/2" x 1-1/8" x 4" Silicone Rubber Setting Blocks Self-Oiling Cutters The black color helps toCompatible with, and Will Not Discolor, Most Silicone Sealants Can Be Used for Food and Computer Related Applications 80 Durometer Hardness These CRL Silicone Rubber Setting Blocks have superior durability, are U. V. resistant, and are compatible with most silicone sealants. They will not discolor the silicone should the two come in contact with each other. Job specific testing prior to start up is recommended with each silicone sealant manufacturer.