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PR142 is a one-part adhesion promoter used to increase the ability of polysulfide compounds to bond quickly and securely to various substrates, especially glass. As a result one of the main indicated applications of PR142 is with sealants for aircraft windshields. Itâ€™s proven to be effective in combating substrate crazing in this application. After applying PR142 using a brush or clean gauze, the adhesion promoter will dry at room temperature in about thirty minutes.