I think I remember reading a long time ago on here that one member contacted Alpha systems and asked that very question. IIRC, Alpha said that Dicor sealant contains a small amount of "petroleum distillate" (death for rubber roofs from what I understand). But that the petroleum distillate gasses off during the curing process, before it can do any harm. So, while they would like you to use "their" sealant, Dicor is an acceptable substitute.
I would search for the post, but it would take me forever. It was one post buried in a lengthy discussion, and it was a long time ago.
I personally have an Alpha TPO roof, and I used Dicor to fill a few cracks and low spots a while back. I had no problems and the sealant still looks good. I applied it per the Dicor instructions, but YMMV as they say.
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