Rust on GFC accessories

Has anyone had an issue getting the rusted plates off of the beef bar? GFC sent me the warrantied replacement side plates and after removing the rack off the campers, the screws seem to be completely frozen. None of them are even close to moving, even with bit/drill and some solid leverage. All four on each side will not budge.

https://www.cosmolinedirect.com/cosmoline-rp-342-heavy-spray-military-grade-rust-preventive/?gclid=EAIaIQobChMIo9Kp88vG9QIVcgytBh1tUQ6_EAQYASABEgKV_vD_BwE

When I first got my camper I had reviewed this thread discussion taking preventative action I disassemble the beef bars and shot them with RP-342 “HEAVY” Military-Grade Rust Preventive Spray

I use this on my entire truck undercarriage when the truck was brand new I live in a snow area that uses salt
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Mine were a bit tricky to take off and I ended up using an impact driver. The bolts are self tapping and I noticed some aluminum corrosion in the bar which made it trickier.