Hi Ken,Underbody and the components aren't prone to rust, as the steel quality aren't that easy to rust to start with. unless the car have been exposed to lots of salt and water during its life time before your ownership. The rust may be just on the surface.
I have seen 1st and 2nd gen celicas, with very little rust on the components you have mentioned.
Removed these parts (if can) and give them a good thick coat of underbody paint. With a good layer of protection. these parts could last longer than you.
Oh i think you have gotten the wrong impression, i am not looking to completely repaint the underside of my celi with anti-rust paint.Ball park figure? if done in Malaysia, labour and paint would set you back from 3k till 5k. Good underbody paint cost you a lot. Not those
rattle can paint, mind you.
If properly and professionally done, then may need to lift the car using 2-post lift to do the repainting. Surely you can;t be expecting the unker mechanix painting under the car while the car is on jack stand. Too little working space.