Dug this old Schwinn Le tour frame out of my parents basement, started off prettyyy rusty, and sanded it down (should've maybe used some chemicals in retrospect?)

Wondering if that spot of rust on the top tube is bad for structural integrity. Just don't want to build this thing and have it impale me haha
Or is there anything I can do to treat it? My brother said por15.





It does feel pretty solid despite this