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touch up with MIL DTL 5541 class 1A

touch up with MIL DTL 5541 class 1A

touch up with MIL DTL 5541 class 1A

(OP)
Is there any reason why we couldn't touch up scratches on a MIL DTL 5541 Class 3 with Class 1A? Either class 3 or 1A properties will suffice. I just want to know if there will be some incompatibility issues that could deteriorate the existing class 3 coating.

RE: touch up with MIL DTL 5541 class 1A

I'm assuming you understand that cl.3 chem film is intended for use where low electrical resistance is required. If you touch-up damaged areas of a cl.3 chem film using a cl.1A process the repaired areas will not have the same electrical resistance properties as the basis coating, and some might consider that a "deterioration" of the basis coating. MIL-DTL-5541F section 6.5 covers interchangeability issues, and section 6.17 covers limits on size of the area that may be touched-up without approval.

You might also take a look at MIL-DTL-81706 which covers materials/processes used for chem film coatings.

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