----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Earl,
In a nutshell your purchasing phosphoric acid. This is nasty stuff requiring the use of personal protective equipment, special handling, and disposal procedures. Check with your local environmental agency on regulatory control and purchase. You may not be able to obtain this for personal use but your A&P can as a business. Your best bet, let your A&P work this issue.
Walt Uebele
1946 Ercoupe 415-C
N94113
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