They eventually fuse into a continuous, rubbery "film" that weaves through the rigid cement structure.
. They allow pros and DIYers to skim-coat "difficult" surfaces—like old vinyl tiles, metal, or adhesive residue—that would otherwise be impossible to bond with standard cement.
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Today, these additives have evolved into specialized systems like from MAPEI or
, making it viable for outdoor use.
Before the mid-1950s, installing ceramic tile required a "full mortar bed"—a thick, heavy, and labor-intensive process that was difficult to master. In , Dr. Henry M. Rothberg, a chemical engineer and founder of LATICRETE , invented the first liquid latex additive for sand/cement mortars. This invention, known as LATICRETE® 4237 Latex Thin-Set Additive
Old-school masons often referred to these liquid latex additives as . The "magic" happens through a process called polymer particle coalescence : They eventually fuse into a continuous, rubbery "film"
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