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If you decide to use "the tape made by a few different companies" be sure that the tape you choose is compatible with TPO roofing membrane material. There are several "generic roofing tapes" some sold at Lowe's and Home Depot, that are significantly cheaper than Eternabond. Some of them have petroleum distillates in the adhesive and it won't "outgas" once applied. That distillate will react with TPO and cause it to fail. So, be sure that the tape you purchase is compatible with the TPO on your roof.