739 Ultra Finish BrushSeal™ Coating is a vapor-barrier coating formulated to match many of the newer types of facing now being used by insulation manufacturers. It is specifically formulated for optimal use on systems operating below ambient temperature but not below 32º F, but it can also effectively be used on some dual systems operating at moderate temperature ranges such as HVAC systems. It effectively retards the passage of water vapor on applications such as chilled water lines, air conditioning ducts, or other pipes or vessels within these temperature parameters. Colder systems than the above are better protected with Vimasco’s 749 VaporBlok™ which has a lower perm rating and is designed for heavy-duty applications. On all cold systems, vapor barrier coatings will only perform well when the proper thickness of insulation is used.

739 Ultra Finish BrushSeal™ is formulated to have a smooth consistency which is easy to apply by brush. It can also be sprayed with the proper equipment. It is an excellent match with the new Knauf facing and also newer facings from Owens Corning and Johns Manville.

739 Ultra Finish BrushSeal™ is a safe, water-based product which has a mild latex type odor. It is fire resistive, meeting 25/50 flame and smoke requirements, and maintains its slightly shiny white sheen after application. It can be used indoors or outdoors though it should be noted that when exposed to UV light its color may dull slightly. Being a water-based product, 739 Ultra Finish should not be applied on flat surfaces where it will be subjected to ponded water.

Protect from freezing during shipping and storage. After application, it must be protected from freezing and from precipitation or condensation until it is completely cured.

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.