67 barracuda floor rust issues

Ive just purchased a 67 barracuda and im going to have to replace the driver and passenger front floor pans. The rears however are pretty solid but are a bit rusty(no holes). Business is pretty slow in the car business so i cant do the resto i want until things pick up. Whats the best way to stop the rust before it gets to bad. Is there something in a spray can that will eat away what i got now and then i prime and paint so it doesnt get worse? or should i try grinding it down first. thanks alot.
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