Seam sealer signs

So, yet again, my customer doing air force work is bringing in a locker that should have been painted already, but again, was not. This raw material shortage is hurting alot of people on the industrial side. Anyway, he has this tactical locker, looks like a big aluminum case. Doors and handles are riveted on, and my problem, covered with something that looks like seam sealer or just caulk. Do not know if the rivets had steel mandrels or they just do this to seal the rivet, but is there a sign if you start painting over a seam sealer that is not a paintable formula? Go down the same road, mil spec painting is alot like SPI, you are told to do it one way and do not change anything, which makes the answer remove it all. But since he wont want to pay for that, I am wondering is there a way to tell when the first primer hits the stuff? Is it immediate release, wrinkling like stripper was put on it?
 
It will fisheye if there is silicone in it. Other than that I would think that most non-silicone sealers would take primer okay if they were scuffed first. You'd have to sand it after curing to see if it's stuck or not, just like anything else. Not a great position to be in.
 
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