Evaporust can & will remove paint if the parts are left in too long.

Been there, done that.

So for marks / paint research, I learned to soak for an hour, check, photograph.

Check again in an hour, inspect, photograph, etc.

Repeat as needed.

The more rust removed, go with shorter times in between to soak, inspect & photograph.

It is amazing what details can be seen if caught at the right time.

Make sure that any parts are degreased first too, so the ER can work on the rust without fighting any residue.