Find a spot where you can see the underside of your roofing material. You can remove the trim from the inside of a roof vent (4 screws) or you might be able to see it by looking down into the shower skylight. If the roof material is black on the underside, it is EPDM rubber. If the underside is the same color as the top side then it is most likely TPO.
You might check on the container of the sealer you intend to buy. Dicor products are compatible with both types of roofing.
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Jack & Marty
2018 Laredo 298 SRL
2011 F-250 SB Crew Cab 4x4 6.7L
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