badkaraoke...
The conventional wisdom seems to favor acrylic mixtures
over EVA.
"There are also EVA (ethylene vinyl acetate) and PVP
(polyvinyl propionate) bonding agents. Neither of these
is very much better in the water resistance stakes, and
seem to be more common in mainland Europe. For the best
water resistance, acrylic or SBR (styrene butadiene
rubber) bonding agents are the choice." From:
http://vaxc.middlesex.ac.uk/~john49/pvafaq.htm
which is a subpage of this informative DIY site:
http://www.axp.mdx.ac.uk/~john49/faq0.htm
Another page from the Super-Tek site, notes:
"Understanding Latex Additives"
"What is latex, and are there different types?
Latex is an emulsion of plastic polymers
dispersed in water. It is used as an additive
with portland cement mortars to enhance bond
strength, water, and chemical resistance.
There are basically four types of latex:
Polyvinyl Acetate (PVA), Ethylene Vinyl
Acetate (EVA), Styrene Butadiene Rubber
(SBR), and Acrylic. PVA is not recommended
since it offers very little water resistance.
SBR has a tendency toward yellowing and should
not be used in grouts, especially out-of-doors
where degradation from sunlight is prevalent.
Acrylic affords the user maximum water
resistance and freedom from yellowing due to
aging and weathering. All liquid latexes
supplied by Super-Tek are formulated from
the finest polymers available." From:
http://www.super-tek.com/doit24.htm
Notice the phrase "to enhance bond
strength, water, and chemical resistance".
This means strength, water resistance
and chemical durability.
This "MasterSpec" page, from The American
Institute of Architects (AIA), also asserts
the superiority of acrylic "in both color
retention and low water absorption":
http://tinyurl.com/15ru
The above page is an html version of a
pdf file, cached by Google, and viewable
in your browser. Or you can download the
pdf file here:
http://www.arcomnet.com/visitor/masterspec/pdfs-mss/02780ev.pdf
Adobe Reader, for viewing .pdf files, is free, here:
http://www.adobe.com/products/acrobat/readstep2.html
"Color retention" refers primarily to
decreased yellowing.
Searches done, via Google:
"ethylene vinyl acetate" acrylic concrete strength
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22ethylene+vinyl+acetate%22+acrylic+concrete+strength
"ethylene vinyl acetate" acrylic concrete durability
://www.google.com/search?num=50&hl=en&lr=&ie=UTF-8&oe=UTF-8&q=%22ethylene+vinyl+acetate%22+acrylic+concrete+durability
If I can assist you further with this matter,
please post a request for clarification of the
answer before rating it.
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