For masonry patching jobs, you can get the components for concrete and mortar, mix then up, and add water.
But for a smaller job, premixed cement material (though in fact cement is only one component in the mix) works well; just add water and it's ready to use. Premixes come in 20- to 60pound bags.
There are three basic premixed cements: mortar, concrete, and sand mix. They can be used for building things from scratch as well as for patching. It is amazing how big a bag of masonry mix looks when dry, but when mixed with water it can reduce to a surprisingly small amount of usable material. On a big job this can get costly.
ADHESIVES, PATCHERS, CAULK, LUBRICANTS
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