In article ,
keyed out...
On Wed, 25 Aug 2004 20:51:03 GMT, eddie torr
wrote:

snipped

Make sure that they use a texture material and not just joint compound
spattered on the walls. Standard JC has absolutely no strength and is
basically just dust.

Take a piece of half inch wallboard & break it over your knee.
Then try the same with a piece that has been taped & mudded.
You'll find this to be way wrong.


Take a penny and lightly scrape drying type joint compound (not setting
type) and scrape along bare joint compound - big gouge & lots of dust

Take a penny and lightly scrape setting type joint compound (not drying
type) and scrape along bare joint compound - less gouge & less dust

Take a penny and lightly scrape it over properly primed joint compound -
less gouge & hopefully no dust.

Take a penny and lightly scrape it over a texturing material such as
Coronado's Tough Tex - NO SCRATCH

Joint compound alone doesn't add strength to a surface and spritzed
joint compound just adds a layer of absorbent dust that will suck the
resins out of paints and will fail any tape test you try - every time. I
will go so far to say that there are likely dozens of different joint
compounds available and a homeowner must rely upon the contractor to use
a good and proper material.
BTW, the tape adds laminar strength to your experiment. However, we are
talking about the cohesive qualities of joint compound and the ability
of a coating to adhere to a particular building material surface not
structural compounding.