I've used both Dicor 501 and Alpha Systems TPO lap sealants on TPO roofs. I can't tell the difference.
Dicor says their 501 lap sealant will work on "most TPO roofs" and it seemed to on my 2010 Roo, but they do make a self-leveling lap sealant specifically for TPO roofs. Their standard lap sealant is 501 in a green tube but they also have a product called ultra-sealant in a blue tube. The ultra sealant also comes with a primer but it may not be needed if you're touching up existing cracked sealant.
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2023 Rockwood Signature 8262RBS
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed
2019 Rockwood Signature 8290BS (2019 - 2022)
2011 Rockwood Signature 8293SS (2015 - 2018)
2010 Rockwood Roo 23SS (2012 - 2014)
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