I used my enduro bike in icy weather as the chances of dropping a lighter bike, with soft compound knobbly tyres was less than a larger 200kg bike.
Salt would be an issue for the chain and I once left the bike covered in salt and came back a week later and the chain was almost solid, liberally coated in ACF50 and checked again in 24 hours and the chain moved freely again.
ACF50 was developed for the US Navy for the aluminium airframes used in a marine environment.
It's safe to say it's safe on seals, I may not test that theory on the caliper seals, but the chain worked fine thereafter.