finish coat material on houses in Reston built
in the 1970's was Ken-o-tex, A spray on material
much like the acoustic spray used on drywall
ceilings. Ken-o-tex was a thick paint, with
vermiculite or styrofoam used for the aggregate,
Kenotex was sprayed on cement basecoats, and
even directly on plywood.
I worked in Reston in 1973, which is how I got
On plywood applications, the joints were taped
and the tape and nails were coated drywall style
with a sticky material that was referred to as
hard-coat at the time. From what I heard, this
hard coat was real expensive, and cost about 50
dollars a gallon back in 1973. This material was
made from casein, which is a milk by-product.
Hard coat disappeared from the market after the
1974 energy crisis, which drove the cost of
Mystic secret revealed !
We patch the peeling kenotex with my own formula
made from white portland cement, Number 3 Q-ROK,
a coarse silica sand, and plenty of acrylic. You
might say we are making our own paint. I hope
our mix lasts longer than the Kenotex.
I can patch the kenotex if it was applied over a
cement basecoat. I doubt this mix will bond to
plywood. If I had to patch kenotex on plywood, I
would need to put on metal lath and stucco the
I don't think they have made Kenotex in 40
The sales person for Kenotex in Reston was "The
Kenotex girl", who traveled around Reston in a
big black luxury car, and wore a tight, very
short leather skirt.
LEADING CAUSES FOR FAILURE:
PLEASE READ THIS !
These metal corner beads are made for
interior plaster. They will fail
over time if used outside. I don't care what
your specs say they should never be used
| INADEQUATE COPING
|This stucco is less than 40 years
old and is already
falling apart due to deteriorated corner beads
inadequate coping (the three side fashing at the
top of the wall is called coping).
|Another townhouse less than 40
years old has stucco
failure and even badly deteriored blocks due to
and missing coping.
|The coping is easy to correct.
just need to cut the rivets holding the front
place, pull it out where it protrudes well past
and put in screws.
|Here we are putting on a new
This wall never had any coping, leading to
My secret formula for patching
stucco in Reston is revealed.
|White portland cement, Number
3 Q-ROK, a coarse silica sand, and plenty of
acrylic is sprayed on with a hopper
|We did the whole back of a
townhouse this way
over a basecoat. If you spray directly over
the Ken-o-tex, the wall can peel and fail
you are just putting good on top of bad.
|Patches are done by hand rubbing
the mortar down
with a rubber float. This way doesn't look bad.
Spraying mortar slops mortar all over the place,
the hand method is more practical for little
It taks a long time to cover and tape off and it
the trouble for small areas