Kingtal0n

A fresh 240 I just picked up has some rust under the spare tire, where the steel wheel lip meets the trunk sump.

I Wire wheeled it clean, easily, it was 1/10 on the scale of bad rust, but still something I wanted to take care of immediately because I literally just got the car and noticed upon inspection (and many other things but they are not the topic of this thread and most I have already encountered so have solutions for prepared).

Next step: Paint it?
Obviously I am not going to put any kind of rust sealant such as por-15. But painting a small patch also seems strange, I suppose I could make small perfect squares in a near color paint approach. This is the topic of the thread to discuss rescue options for on-site inspection topics (as approaching a car for the first time and making subtle appropriate repairs/modifications to remain in a daily driver status that may occasionally transport a passenger or two).

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5.3/4l80e/turbo 240sx playthrough:
https://tinyurl.com/turbo240

Chaluska

just do it the easy way... sand off the rust, and then hit it with some epoxy primer. then rhino line the spare tire area... done

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coupesallday!

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Kingtal0n

A great idea... but 1. it involves "adding" weight the car. I may run with no spare, nothing in the rear except the cloth liners that give the 240sx a semblance of having a trunk. I spent all night cleaning out the quarters, I found about $3 in pennys in there. Who puts pennys in those spots!!

2. it permanently changes the trunk area. I usually do not perform modifications to my 240sx that permanently change anything. My usual interest is to clean it up, remove anything practical (weight vs benefit), perform longevity maintenance (this falls under that category, like repairing an oil seal).

Note that #2 does not apply to the original KA engine if it has high mileage because it means swap time is around the corner, so imagine the car with no engine, all washed up and ready. Thats what I see in this chassis.

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5.3/4l80e/turbo 240sx playthrough:
https://tinyurl.com/turbo240

cchondro

I used a 415 treatment (or like you stated in the original post, similar to a por-15) on my old coupe a while back.
Just apply and it eats the rust, seals, and protects against further break outs.
Also doesn't add much to any weight. Around the same as paint.
& as far as "permanently" modding your 240sx, I don't see this as a "negative thing", rather a positive thing.

Kingtal0n

Well it looks good on paper. but what about the seam glues? The rear is full of factory glue that interacts with a fringe on the metal. You cant just "por-15" over the seam glue- it is not designed for that. And you can't just paint around it either.
Not to mention the factory paint is looking great, and everything looks very clean and decent in there... Its just those few spots that got a bit of rusty. (on this chassis).

I also need to make a decision about the battery tray. Will I cut a hole for the intercooler? Or work around that. Hmm thats more of a personal choice though.

cchondro

It's not going to eat through the factory seam glue.
It's designed to seal and protect, not destroy every other epoxy or glue in it's way.
It laid right on top and sealed around it. Had no issues with the seams coming up, or the
treatment eating through it.

I'd recommend doing more research for yourself. Seems like you don't know all the facts on it yet. Also, it cost right around 100$ for that whole area so it's not expensive either.
Also, you keep complaining about how the factory paint is good under there, and not wanting to "permanently" modify you car. Yet you are also asking about cutting a hole for your IC piping.
(Hope that didn't sound rude)

But as far as battery tray/IC piping. I drilled out the tap welds on mine and then cut a 4x4 square out for my piping. Clean and works like I needed it too.

Kingtal0n

Sorry my friend, I like to see my seam glue nice and factory. That black coating is permanent. Always I can add it later if I want...

I think I am just going to clean it up and make small precision paintings with a near color and then put down some carpet/mat under the spare to keep it from rubbing on the paint.

As to the intercooler... I think I will run the sidemount and leave the battery tray (and huge battery ) alone and cleaned as well.

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5.3/4l80e/turbo 240sx playthrough:
https://tinyurl.com/turbo240

Kingtal0n

I decided to primer it at least. I Scuffed it up real good, and I am taping it off around the seam glues (so I dont paint over any glue).

there was an area to the left (driver side) where the original foam was "glued" (they use glue from the factory?) to the trunk. So I brushed that mess off... which of course took away some of the paint. So I will primer to whole trunk, to the inside of the seam glues. pics in 12-24 hours (its dark now)

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5.3/4l80e/turbo 240sx playthrough:
https://tinyurl.com/turbo240

Kingtal0n

So now I steel wool it / wet sand it and... I am deciding whether to actually put down some color or leave it primer gray (grey).

Also, I believe water is getting into the trunk either through the spoiler stud holes, or the tail lights, as both of those are common 240sx spots for leaks.
I know what to do about the tail lights (sticky black goo). But the spoiler studs? Besides welding them shut ....

__________________
5.3/4l80e/turbo 240sx playthrough:
https://tinyurl.com/turbo240