Where is the rust appearing? I've noticed that TA-22 and TA-23 cars have some pretty poor drainage on the rear corner of the side chassis rails near the wheel arches on the inside of the car. If you've got rust there like me, you probably need to cut the rust out and weld on a bloody think plate of steel to strengthen that bit up. If however you've only got surface rust on some panels then just sandblasting can sometimes work (as long as you aren't too harsh) or just grabbing wire brush attachment to an angle grinder (note that's slightly dodgy way of doing things) and then using a rust converter and respraying the panel (as long as you can match the colour). Respraying is generally necessary to fix rust up.
The problem with rust, is if you don't nip it in the bud hard straight away, it'll come back and rear it's ugly head until your car is a chunk of rolling iron (II) oxide.
If however you just want to do a bandaid job and let your car slowly die without you noticing, just get a bit of touch up paint, matych the colour, put a bit of rust converter on the spot and spray over it and pretend that your car won't get any worse (well it won't for a couple of years anyway)