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Grout comes in 4 basic forms: Sanded,
Unsanded, Premixed and Epoxy Based.
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Sanded Grout is the best choice for most projects.
Sand adds to the strength and helps to prevent shrinkage.
Sanded grout is intended for joints up to 1/2". Look for
polymer fortified versions. I use sanded grout almost
exclusively. Note: The sand particles can scratch the
surface if delicate glazes and mirrored glass. This can be
prevented by careful cleaning with a light hand. You may also
tape off these surfaces to protect until you are finished grouting.
Most sanded grouts can be used indoors and out and in moisture rich
conditions. Check the back of the box for manufacturers
recommendations.
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Unsanded grout can ONLY
be used for grout joints that are 1/8" or smaller. If
the joint is any larger the grout will crack, it may sink, and it is
also very difficult to smooth out. Note: if your joints are
1/8" or less you can still use sanded grout.
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Premixed comes with wet with the liquids added
and can be used directly from the container. I know you are
thinking "ahhh! This sounds great!". Remember easier is
not always better. Most premixed grout is unsanded and
subject to the same problems. I find it difficult to work with
and personally believe it is never a good choice.
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Epoxy grouts can be used where high levels of
moisture are present. Most epoxy grouts are water proof and
will withstand the worst conditions. Epoxy based grouts will
come in multi part containers that need to be mixed in specific
proportions. A hardener, a resin and sometimes a separate
aggregate. Epoxy based grouts are more difficult to work with,
to clean up and I suggest before tackling a prized piece you
practice using it.
