Floorboards...
It depends on the condition. If crusty exfoliated rust but solid, sometimes a needle gun will knock off the chunks whereas a wire wheel will polish the rust chunks. I once removed exfoliated rust which was probably 1/8" thick from a Jeep frame and was amazed to find stamped numbers on the frame that were still ledgible on the frame. I also used a needle gun at a pretty flat angle on the firewall of a 54 chevy and it flaked off all the paint without denting the surface, right down to the factory red oxide primer! It was absolutely amazing.
But I see you are in CA so there is probably some pretty good metal. I don't think there is just one tool for the job. I'd probably use a DA sander with 60 grit on the flat areas, a needle gun on thick chunky exfoliation and a wire wheel on an angle grinder for large rusty areas as well as a die grinder with a small wire wheel for those narrow troughs. Harbor freight has these orange plastic brushes for die grinders which have abrasive particles in them and those work really good. I used them on my cowl vent slots with great success to remove paint.
Good luck. Only thing worse is hand sanding louvers in hoods.
It depends on the condition. If crusty exfoliated rust but solid, sometimes a needle gun will knock off the chunks whereas a wire wheel will polish the rust chunks. I once removed exfoliated rust which was probably 1/8" thick from a Jeep frame and was amazed to find stamped numbers on the frame that were still ledgible on the frame. I also used a needle gun at a pretty flat angle on the firewall of a 54 chevy and it flaked off all the paint without denting the surface, right down to the factory red oxide primer! It was absolutely amazing.
But I see you are in CA so there is probably some pretty good metal. I don't think there is just one tool for the job. I'd probably use a DA sander with 60 grit on the flat areas, a needle gun on thick chunky exfoliation and a wire wheel on an angle grinder for large rusty areas as well as a die grinder with a small wire wheel for those narrow troughs. Harbor freight has these orange plastic brushes for die grinders which have abrasive particles in them and those work really good. I used them on my cowl vent slots with great success to remove paint.
Good luck. Only thing worse is hand sanding louvers in hoods.