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Old 11-06-2005, 06:05 PM
  #4  
linclogs
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Join Date: Aug 2002
Location: Lincoln, CA
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Default RE: Midwest Aerogloss paint-

I've used dope for years. As a kid I used Testors and occasionally Aerogloss. Then got into using SIG and have used only SIG for a long time. But somewhere along the line, I read that Aerogloss is not compatible with the other brands. Don't know why IF they are all 'butyrate' dope. But the thinners MAY still be compatible. I'm not sure.

Even SIG dope has changed in recent years. It used to be great to work with - it would stick covering easily to concave surfaces (like under-cambered wings) but no more. Succesive coats tend to "un-stick" the covering off such surfaces and the cloth wants to "bridge across" these areas. I emailed the "SIG Factory Fliers" (as they like to be called) several years ago and described this "new" problem. The answer I got back was (and I'm quoting), "Yea, we know". No explanation or recommended cure. Then later, someone told me that ALL dopes had to change part of their content per the EPA and that was why they don't "act right" anymore. Also, SIG's label now is much more comprehensive regarding the inherent dangers of their product. The label on an older can I have states, "DANGER: Contains Cellulose Acetate, Acetone, Methyl Cellosolve Acetate, and Toluol. If swallowed do not induce vomitinmg. Call a physician immediately. Keep away from heat, sparks, or open flame. Avoid contact with skin or eyes, and breathing of vapor spray mist. In case of contact with eyes, flush thoroghly with water for at least 15 minutes. Get medical attention. Use only in a well ventilated area."

That was the extent of their "warning".

The newer label sounds much more ominous as this has been added: "Containes MIBK, MEK, NBA, and E3EP..... Prolonged or repeated exposure by inhalation of high vapor concentrations and/or by repeated skin contact with the liquid may cause delayed or serious injury to the nervous system, blood, kidneys, liver, or lungs. USE ONLY IN A WELL VENTILATED AREA! The use of respiratory protection (NIOSH/MSHA TC 23C or equivalent) is strongly recommended. In case of contact with skin or eyes, flush thoroughly with water for at least 15 minutes. Get medical attention. KEEP AWAY FROM CHILDREN.
"NOTICE: Reports have associated repeated and prolonged occupational overexposure to solvents with permanent brain and nervous system damage. Intentional misuse by deliberately concentrating and inhaling the contents may be harmful or fatal".

Sounds like pretty nasty stuff. Let's see... how many years did I sit at my workbench (actually my Mom's card table) doping my latest model project while growing up?

Iaclmac was right on - "testing is always the key".

linclogs
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