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PR148 is used as an adhesion promoter. Used correctly, PR148 boosts the adhesive characteristics of polysulfide compounds to a wide range of surfaces. A one-part compound, PR148 is most suitable for application by brush or a material, such as clean gauze, that conforms to AMS 3819. Although PR148 does not soften finishes, it is not recommended for use on surfaces where solvent crazing may occur. Depending on the temperature, PR148 will dry in 15-45 minutes.