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EPDM is essentially the same material used in the manufacturing of tire tubes. When tubeless tires became popular the manufacturing plants were running out of work. Some smart person deduced that if EPDM could hold air it should also be able to keep water out. The plants were then modified to make large sheets of EPDM for roofing. Minor changes were made to enhance characteristics like UV protection. EPDM is now one of the most popular choices for large commercial buildings because of its lower cost and ease of installation. It also works very well on RV roofs. Some popular brands are Goodyear, BF Goodrich and Dunlop. Do not use any sealants which are fossil fuel based (ie Roofing tar) as they will react negatively with the EPDM.
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