how do i fix body cancer?

Cut it out and weld in new panels is the best way. Or, if it's a CJ7, replace the tub with a rust free Wrangler tub (which is probably the easiest way to go).

Don't use bondo as a filler it absorbs water. There used to a product called aluma lead. It's a 2 part mix check Eastwood.com they would probably have it or something similar. If you don't want to weld or have money for it 3m makes a body panel adhesive. Main thing is get a wire wheel on your drill and get the heavy loose stuff off. Wipe with acetone or rubbing alcohol than spray with a epoxy paint, or a rust product like por 15, or over the counter stuff at the parts store. It really depends on how heavy the rust is and how smooth of a finish and money you want to invest.

You can also pop rivet panels on, recess the rivet and fill over them. It will work fine. The trick to using body fillers is that you don't want too thick of a coating. I think less than 1/8". Tigerhair can go thicker bkut you should still keep the thickness down to a minimum.

If you want to do it once and be done with it you want to invest more into rust prevention going forward. POR is great stuff but can be difficult to work with. READ AND ADHERE TO ALL THE INSTRUCTIONS. I've had good luck with Extends too. I haven't seen it in the store lately but I think Permatex makes it now (called something else).

Of course you can always cover it up with body armor and paint the armor plates to match your Jeep body.

No matter what you do it will be back. Just bite the bullet and switch to a fiberglass body.

Another option is using premade panels.

You'd most likely want to weld them in.

Google "Jeep repair panels" and you will find a few sources.

Pics i looked at tub is not worth putting money into it,floor mats carpet run it ???

It will always return, its insidious. Just cut, patch and repeat.

Take the roll bar out because you'll find it rusted out under that too. Buy repair panels and weld them in as was said.

Once you start digging you'll probably find rust under the paint along the wheel wells and rocker panels. All CJs rust out there.

Check you frame too. Specifically over and behind the rear axle, on the inside of the frame. The frames are a clam shell design to make the box tubing. The outter wall is 3/16" steel. The inner wall is 1/8". the inner wall always rusts first. You can get nice repair panels for those too. I put them on mine.

Blinker issue is probably a ground problem or you need to clean up your housings.

Ok I said it before now I will explain. If the frame is good and you want to proceed with the body ok. By the time you buy and weld in the patch panels you will be close to or over $1200.00 in cost. The rust will only come back and you can do it all over again in about 3 yrs. Or you can spend about $2400.00 and by a decent fiberglass body and do it once and be done. Like Wayne said there isn't much to save on that tub. I would also look to get a newer style rollbar the one that you have is not going to help you much in a rollover. Also check your body mounts as well as the other areas that were mentioned for rust on the frame. I know it seems cheaper to fix what you have I thought the same thing and did what you are planing on doing, I did mine and with in 2 yrs the rust was back in the bed and rear fender area as well as the frame. Good luck and if I can be of any help let me know.

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Take your time, prep it properly, use a good rust penetrative primer, be careful not to get into it with your prep work, it should last a long time.

That was less than $200 in metal, maybe $200 in paint and prep, which I was going to do anyways.

Fiberglass is an OK option, but brings up a whole host of other problems, namely electrical grounds and it does not play well with repeated off road abuse, and it is a lot of holes to drill

Besides, I hate fiberglass repair, but metal repair is usually handled by a hammer on my trucks

Another good source for high quality (thick) floor pans and panels...

http://www.classicent.com/jeep.php#7695

I used their full length floor pans..

Gavan you bring up some good points. I did the floor pans in my CJ as well, in fact they were the only things that didn't rerust. Yes changing to a glass body is not for those without skill. Just ask Slimer he is just about done his glass body. But if he plans on keeping the Jeep (forever) then its the way to go. Yes they can have problems on the trail, I have hit mine pretty hard (hard doors poped open) with no issues but I also have a custom built body so it really dosen't count.
In the end it really comes down to what he can afford and is comfortable doing. I wish him good luck either way and will give him advise either way.

You can get years out of a body with cut and patch. Its the way of the Jeep