Troll the internet for discussions on CorrosionX and ACF-50 and you'll see claims it causes loose rivet-so-called "smoking rivets" due to a stain that trails downwind from the rivet along the paint. Our discussions with shops and manufacturers revealed you may see smoking and loose rivets after treatment, but not for the reason the internet trolls claim. FTFCs are fogged into the airframe in a uniform mist, settling on all the interior surfaces, and then flowing into small spaces, between skins and ribs, between lap joints and even along rivet shanks.
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