WC-1 Type C is a cork-filled mastic with low thermal conductivity and good moisture resistance. WC-1 Type C is used to retard condensation on the surface of piping, tanks, or other equipment which operates at a temperature below the dew point of the ambient air. It is designed for use on systems involving moderate temperatures such as cold water lines, but will not be effective on extremely cold surfaces. Normal applications range from ¼” to ½” total dry thickness.

WC-1 Type C is suitable for application by trowel or spray. Surfaces to which WC-1 Type C is to be applied MUST be clean from oil or other contaminants. Carbon steel must be primed with a primer approved by Vimasco prior to application of WC-1 Type C.

After proper application and complete curing on an appropriate type of system, WC-1 Type C, provides not only condensation control, but also some additional corrosion protection and sound deadening properties. It dries to a heavily textured appearance with the cork showing through the surface of the coating.

It is recommended that up to 4 applications of WC-1 Type C be used to obtain the specified dried thickness (depending on the desired thickness and the application conditions). Each coat should be allowed approximately 24 hours drying time (depending upon ambient conditions) before applying more material over it.

WC-1 Type C is a water-based product so it poses no health or flammability hazards on the job site. WC-1 Type C should not be applied where it will be exposed to continual standing or running water as this will eventually soften and degrade the coating.

Product Information and Data


In accordance with OSHA Standard 29 CFR 1910.12 (Right to Know Law) a Material Safety Data Sheet is available for the product and all Vimasco products.


Vimasco products are designed to meet the needs of specific situations. They are warranted to be effective for their intended uses only. No further warranties are expressed or implied. The methods and condition of application over which we can exercise no control are important factors in the performance of our products. We make specific recommendations for the application and use of all Vimasco products, but we cannot enforce our recommendations upon users; therefore, it is necessary that we state, as a condition of sale of our products, that we will replace or refund the purchase price of any Vimasco product found by our laboratories to be defective, but that we assume no responsibility beyond the purchase price of the materials. No representative of our Company, Distributor or Agent has any authority to change or extend this condition of sale.