robin1(at)mrmoisture.com
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 Posted: Fri Mar 02, 2007 8:22 pm Post subject: ProSeal for the archives |
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You guys are killing me with your butchered description of my Beloved
ProSeal. ProSeal is a high quality PolySulfite Thixotrophic (Sticky
Shit) made exclusively by DeSoto, a division of PPG (and unfortunately
for my cloths a staple of the Air Carrier Industry - part 121). Van and
their Flame Master Product though a "Knock off" form of such a quality
product is not and will never be my ProSeal. Like Charleston (Ben Hur
and Moses) said "you will have to pry it from my dead hand".
There are four distinct reasons for failure in application.
1. Expired product.
2. Improper mix procedure... John G. you can chime in here.
3. Improper atmospherics like humidity or extreme temperatures.
4. Operator error in the installation/application.
This is the glue that holds airliners together.
The product you are using, (which I would venture to say is not my
beloved Proseal) comes in paintable "A" (like syrup) and extrudable "B"
(like old toothpaste). Properly applied I can create a convex 1/4
fillet as small as 3/32" of an inch, and then apply a fillet spoon to
convert it to a near flawless concave seam of beauty. In bead sizes
larger than 3/8" in the hands of an epileptic (no offence intended) I
can take a disgusting irregular "sloppy" bead, Mist it with Isopropyl
Alcohol and while using a cheap latex glove convert it into a smooth
final product. The alcohol evaporates without altering the catalyzed
bead.
Within minutes it can be cleaned with alcohol. Within hours it requires
MEK (which you better know what you are doing). We NEVER ever use
Toluene although we have it cause it alters and adulterates the final
chemical, cured composition. My beloved Proseal is paintable, it is
removable (but a real BITCH) and sticks to any and everything that is
clean.
Now as to pulling a vacuum, nothing could be further from proper
technique. A vacuum (negative pressure) causes atmospherics to enter
from outside of a tank. It leads to bead failure. I guess a slight
positive pressure could help wick Polysulphite into a fayed seam from
within the tank but using correct procedure is always recommended. The
slightest excess in either Negative or Positive is going to reform your
pristine tank into a new beast. Proseal can be laid over clean,
previously applied and cured substrate. The secret is getting it to the
specific area of the leak.
This is Experimental Aircraft Manufacture so you boys and girls have fun
playing with chemicals and toys of dubious result from your chemistry
cabinet.
John Cox
the Turbanator #40600
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