Old timer at a job site in Toledo gave me one line about mortar that stuck
Was mixing mud for a fireplace surround in Toledo back in April and this guy named Ray who has been laying brick for 38 years watched me slop a batch together. He just said, if it slides off the trowel clean, it is too wet for a chimney. I started testing every batch on the trowel face instead of eyeballing it, and my joints stopped sagging on hot days. Takes me maybe ten extra seconds per batch. Anyone else got a quick field test they swear by for gauging mortar stiffness?