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Procurement is to conduct testing of various silicone-based coatings to replace existing protected surfaces using an airless spray system. RTV 157 is a high strength silicone adhesive sealant currentl... Procurement is to conduct testing of various silicone-based coatings to replace existing protected surfaces using an airless spray system. RTV 157 is a high strength silicone adhesive sealant currently used on . RTV 157 requires extensive thinning in order to make it sprayable; however, due to increased EPA regulations regarding the use of thinning agents, testing is required to identify alternative coatings to replace the use of RTV 157.