We use one process to chemically convert aluminum. Based on how long the aluminum stays in the chemical conversion chemical determines how thick the coating is when it comes to being able to pass the electrical resistance testing for a class 3 coating. The salt spray test requirements for either class 1A or class 3 is the same. If we coat our test panels to a class 3 and pass the electrical resistance (pre and post saltspray) and pass the salt spray test it is logical to assume that a class 1 conversion coating would pass the saltspray testing as well. My question is if I label my 5 test panels as class 3/1A would that cover the mil spec 5541F section 4.2.1 or do I need to supply 10 coupons total... 5 for class 1A and 5 for class 3.... which is what the spec seems to read... logically it makes sense that I only need 5 but what would a NADCAP auditor conclude?