+ 1 strip it and roll it on its side.

Unless you beat off 12 times a day there is no way your arms, eyes or anything for that matter will be able to cope with prepping and painting while laying under a car.

dont do it to yourself.

Considering that this thread started almost 3 years ago the underneath could have been painted with a nail polish brush by now

+1 for getting a hoist

the panel beater who welded in my trans tunnel finished it off with spray on black gunk body sealer / sound deadener so I got the name of that stuff and sprayed it everywhere underneath

It's still not painted :)

datsunbeginner, if you know how to paint, you must have contacts then?? I presume you must have had a few yrs experience spraying and prepping cars?? Or are you a qualified DIY backyarder ?? The moral of the story was.. If you know what your doing , fine do it.. If your half sure and half cocked, go get it done professional.

Ok so where has 3 years gone......?
$hit that time has passed fast and since i started this thread il say my ute has had plenty of work done to it and will be a little ripper one day.
A quick rundown of events......I started my own business not long after asking the question "easy ways to paint underside of car" and being a workaholic i spent the next 18 months putting in my time to building houses and getting established under my own business name. During this time i persuaded a family friend to let me rent (boxes of beer and plenty of them) to take my ute to his sheet metal factory for some rust repairs.
Whenever i have no work in construction i go spend my days at the factory tinkering away with my ute. One little thing leads to another and me being me cant settle for anything under the best. I stripped it out and the fabrication began,
-Made my own tunnel
-replaces both floor pans
-replaces about 150mm into the tray and 50mm up the cabin firewall
-tubbed the rear

At this point "rob" was doing a 4 link rear end in his ute and the ideas started as the skill levels got better. I did my research and other than doing IRS i found it to be second to none.....knowing this was going to be the best for handling and getting the HP to the ground, i i must do it.

Next stage
-A frame to carry the front link mounts was made and mounts attatched (this was now getting into precise fabrication and made out of the car to slide in once everything was ready)d
-from this frame i sleeved the original chassis rails with 3mm
-Due to fabrication of my own tunnel i no longer had gear box mounts so these then got fabricated off the chassis rails
-battery carrier was mounted to the frame along with future hanging lugs for exhaust

Now the car was at an important stage i talked the racing car off the hoist and got the ute up there to mount this frame/chassis rails under the big rig.
At this point i filled the factory with crap by sand blasting all the underside and gave it a light coat of etch primer (industrial paint was in the factory so that's what it got). While the boys at the factory thoughts where changing from 'old #OOPS#ty dato resto' to 'a little super car' the interest grown and ideas where flowing.....WATS LINK.....
-Adjustable wats link frame was designed a few time but we got there and that then got made and fitted
- I made a new numberplate hanger as original had been molested at some point
- Once everything was welded and i was happy it got some POR15 sprayed under and stone guard.

The underside looks great! So much work has evolved since the original post but i am one to always make something the best it can be......'job worth doing is a job worth doing right'

Currently i am working on the engine bay and getting ready to sand blast that. The skills i have acquired doing all this has been a great learning curve.
Since finishing the underside i moved onto seat fitment and now the engine bay.
Bit by bit things are getting done and before to long it will be headed for a pannel beaters to get paint.

Thats the update in short lol
thanks for reading Rhys

Where's the pic all that talkin ;)

I think having it 500mm off the ground will not allow enough work space for you to be able to properly access the underside and remove the stoneguard. The last time I did it manually with a grinder on the guard inners it took a lot of effort to remove the material and achieve the bare metal finish. It will be exceptionally difficult laying on your back working out of place, so difficult that the outcome would most likely be sub standard and potentially a waste of time. If you give yourself the optimum working position you will achieve a very good result.

Sand blasting is the best way to remove the stoneguard and bituminous coating on the underside,

Here's one of mine in the blast yard now ready to go under the nozzle.

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  Ready to Blast.jpg (156.68 KB)

Wow Chris you must have big muscles to lift that shell up there!

Definitely looks like its a good way to get to the underside.

Haha nah, we use those stands to make galv tanks. The shell is very very light maybe a couple people could definitely lift one side up then the other.

YOU will be the muscliest man on the planet if you do the underside of your car on jack stands, you'll have the girls all over you.......! And mik so there is a downside to everything.