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I dunno, Freddy and chemist not. Think about this - why would a urethane manufacturer put themselves at the legal and monetary risk you both say is so certain? Especially for $3/tube urethane? Besides, most of the primerless I've seen costs more than non-primerless per tube. I don't use primerless myself, but still your arguements seem baseless to me.
Read the original post. The question was whether it’s ok to use regular, not primerless, urethane, without primer or with a primer from a different manufacturer. The answer is no and no.