Mine was EPDM. About 3 years those started "popping up". None came through the membrane. Debated on it and cut EPDM patches to cover them so they wouldn't pop through (about 15-16), rolled them on and sealed them. When I traded it in almost 4 years later not a thing had changed. IMO it worked out fine.
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Danny and Susan wife of 55 years
2019 Ram Laramie 3500 6.4 4x4 CC 4.10 SRW
2020 Montana High Country 331RL
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