Stop in for a cup of coffee

Yea should be fine. Just remember the term encapsulated just means it seals off any air or moisture from getting in and letting the rust continue it eating the metal. If it doesn't seal off properly then it's a problem.
Don't really think your car is going to be in a lot of salt or water so don't see it rusting away too fast.
Eastwoods stuff has a chemical that treats the rust and stops its growth. My company uses underneath on humvees during refit