Undercoating the Undercarriage?

[AJG1996]

Ive got a 1971 F250 with a 428 and some pretty rough body work... Im saving up for the body work but I was thinking about undercoating (with a spray can) the under carriage to seal and protect it as well as hide the rust and make it look a little nicer for only about 30 bucks... Has anyone done this, or have a better idea? Thanks

[sargentrs]

Depends on how bad the rust is. If you're talking flaking and bubbles, you don't want to paint over that with anything without knocking the loose particles off and trying to get it down to firm metal then coat it with some rust converter or encapsulator before painting. If it's just light surface rust in spots, then, well, same thing. I wouldn't just paint or use undercoating on top of rust, it's going to make it rust more and faster. Of course, as always, that just my

[cowbay]

Depends on how bad the rust is. If you're talking flaking and bubbles, you don't want to paint over that with anything without knocking the loose particles off and trying to get it down to firm metal then coat it with some rust converter or encapsulator before painting. If it's just light surface rust in spots, then, well, same thing. I wouldn't just paint or use undercoating on top of rust, it's going to make it rust more and faster. Of course, as always, that just my

if you have some rust issues deal with that first otherwise it will just continue