> -----Original Message-----
> From: edison
> Sent: Wednesday, May 03, 2006 6:13 PM
> 
> 
> As for "elastomeric" being equal to something bad and 
> unbreathable, I will 
> have to challenge the group's sensibiltites on that one. Show 
> me the data! I 
> have seen elastomeric coatings (including a couple of ours) 
> out-breathe some 
> of the so-called 99% breathable silicate coatings. Pore 
> structure, pigment 
> volume concentrations, microfoam and film thickness are 
> factors that affect 
> moisture vapor transmission rates. Some elastomerics are 
> extremely breathable, 
> some aren't.

Is this true of 100% fluid-applied acrylic elastomerics? Can vapor
permeability be engineered into those films? The products that I have
seen are intended to serve as waterproofing membranes, usually on roofs
or concrete. Is vapor permeability possible at the thickness rates they
are recommended for? (15 mils minimum, up to 50 mils when incorporating
reinforcing mesh.) Is vapor permeability a desirable characteristic for
such films? 

The little bit of info on the Rhino Shield site suggests it is a
two-part application with an initial "adhesive base coat" layer. I too
would like to see the technical specs, but having fended off some of the
products that John Leeke refers too, they are loathe to provide any info
about what it really is ("proprietary information"). So in the absence
of being able to "show you the data," I will choose to remain highly
suspicious and skeptical of any so-called "miracle lifetime solution."

"Rhino-Shield Ceramic Coating is a durable, flexible maintenance free
wall coating. It is 100% acrylic waterborne, high build formula that
waterproofs, insulates, and soundproofs. Innovative technology combines
elastomeric acrylic resins with urethane resins resulting in a flexible
but tough surface. This thick rubber-like membrane actually becomes part
of the substrate due to excellent adhesion and bonding."

Later on in their Q&A FAQ they say these various things:

"Q: Can Rhino-Shield be applied to historic homes?

"A: You should always verify the rules for historic areas; however,
Rhino-Shield will be readily acceptable in most areas. Rhino-Shield
restores and beautifies old wood.

"Q: How does Rhino-Shield coating compare to vinyl siding?

"A: Rhino-Shield is usually about the same price or a little less than
vinyl siding. One main difference is the consumer keeps the natural look
of the home's exterior. 

"Q: Does this product breath?

"A: Yes. This product is totally gas permeable and allows water vapor to
escape.

"Q: How thick is the Rhino-Shield product?

"A: Ten to twelve times thicker than regular paint."

dan I still say run ellen run becker


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