Historical clue formulations

• Place for a handprint, maybe — 2022-06-25
• Firmly bond — 2022-05-06
• Mortar = sand + water + ___ — 2020-10-25
• Bond tightly — 2019-03-17
• Solidify, as a friendship — 2016-07-12
• Sidewalk material — 2016-03-07
• Solidify — 2010-07-11
• Fix firmly — 2007-08-12
• Dental compound — 2005-01-12
• Fix permanently — 2004-07-18
• Make firm — 2002-09-01
• Good binder — 2002-02-16
• Dental fixative — 1995-02-25