739 Ultra Finish Brushseal™
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™ features 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, It should not be applied on flat surfaces where it will be subjected to ponded water.