Trying to remove rust on underbody *pic included* - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SimpleS14 · 06-13-2009, 06:20 PM

I noticed I have quite a bit of rust forming on one particular area underneath my car. The under coating has chipped away and what is left is rust. For now i think this is just surface rust.

Before I check out local shops, I wanted to know if there is a DIY solution I can try first.

I was thinking about renting a power sander (or wire wheel), start to sand this off and spray some primer on it.

Here is a pic of what it looks like:

flip3d · 06-13-2009, 06:26 PM

navy gel and undercoat it.

SimpleS14 · 06-13-2009, 06:43 PM

Quote:

Originally Posted by flip3d

navy gel and undercoat it.

Where can I get navy gel?

Any recommendations on undercoat to get?

gregfarz78 · 06-14-2009, 09:43 AM

Quote:

Originally Posted by flip3d

navy gel and undercoat it.

lol worst idea ever thats way beyond surface rust its rotting only correct way is cut it out and weld in a new peice.

flip3d · 06-14-2009, 08:26 PM

Quote:

Originally Posted by gregfarz78

lol worst idea ever thats way beyond surface rust its rotting only correct way is cut it out and weld in a new peice.

well, yeah. if its rotted all the way through navy gel wont do shit.

Bigsyke · 06-13-2009, 06:44 PM

No undercoat, I did that 1 year ago and it rusted 10x worse.

Wirewheel it, either patch it up with some sheetmetal, or get some rust bullet.

SimpleS14 · 06-13-2009, 07:43 PM

Quote:

Originally Posted by Bigsyke

No undercoat, I did that 1 year ago and it rusted 10x worse.

Wirewheel it, either patch it up with some sheetmetal, or get some rust bullet.

Thanks, I never heard of Rust Bullet until now. I'm definitely going to check it out.

PinkPanther · 06-13-2009, 07:56 PM

my S14 rusted up in the same place. i sandblasted the rust away and painted over the bare metal with POR15. Its the best stuff out there, kind of expensive but better than rust bullet.

sidewayz240 · 06-13-2009, 10:18 PM

That looks like rott to me, not just surface rust. Poke at it with a screw driver.

Pull up your carpet, cut out rust, weld in new metal.

Def · 06-14-2009, 05:51 PM

Yea, I bet you could screwdriver right through that part. Naval jelly would leave you with tons of pinholes I bet after it reduced all the rust.

VQMaxFan · 06-14-2009, 05:52 PM

POR15 that ish

bigOdom1 · 06-14-2009, 06:03 PM

ive heard of and seen some good results (on a friends mkiii) using por15

soreballz · 06-14-2009, 08:44 PM

lol, thats not surface rust.

Good luck!

onehundredoctane · 06-14-2009, 08:59 PM

your really need to cut it out, either fab a piece to go back in, or cut the floor from a good one at the junk yard, it just depends on how serious you are about fixing it, if your not really concerned and just want to prevent it from spreading then strip the area in question down to bare metal, including a 2 inch area past the affected rust area, then por15 the hell out of it.

Bigsyke · 06-15-2009, 01:55 PM

Doesnt por15 need a properly prepped surface to work? ive heard rusty surfaces are ineffective for por15. POR stands for paint over rust, but my research has wound up concluding that the metal needs to be clean and prepped for the por15 to actually be effective.

06-13-2009, 06:20 PM	#1
SimpleS14 Post Whore! Join Date: Feb 2002 Location: Philly Age: 42 Posts: 9,185 Trader Rating: (0) Rides Gallery: SimpleS14 Feedback Score: 0 reviews	Trying to remove rust on underbody pic included I noticed I have quite a bit of rust forming on one particular area underneath my car. The under coating has chipped away and what is left is rust. For now i think this is just surface rust. Before I check out local shops, I wanted to know if there is a DIY solution I can try first. I was thinking about renting a power sander (or wire wheel), start to sand this off and spray some primer on it. Here is a pic of what it looks like: __________________ *Goals are dreams with a deadline.* L.H.O.O.Q.

06-13-2009, 06:26 PM	#2
flip3d Zilvia FREAK! Join Date: Feb 2008 Location: Ft Lauderdale, FL Age: 37 Posts: 1,473 Trader Rating: (1) Feedback Score: 1 reviews	navy gel and undercoat it. __________________

06-13-2009, 10:18 PM	#9
sidewayz240 Zilvia Junkie Join Date: Mar 2005 Location: Toronto Age: 34 Posts: 327 Trader Rating: (6) Feedback Score: 6 reviews	That looks like rott to me, not just surface rust. Poke at it with a screw driver. Pull up your carpet, cut out rust, weld in new metal. __________________ -Trevor

06-14-2009, 05:51 PM	#10
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	Yea, I bet you could screwdriver right through that part. Naval jelly would leave you with tons of pinholes I bet after it reduced all the rust. __________________ S13 Hatch - Goes around tracks quickly DEFSPORT

06-14-2009, 06:03 PM	#12
bigOdom1 Nissanaholic! Join Date: Nov 2005 Location: Auburn/Birmingham AL Age: 41 Posts: 1,817 Trader Rating: (4) Rides Gallery: bigOdom1 Feedback Score: 4 reviews	ive heard of and seen some good results (on a friends mkiii) using por15 __________________ my car domain that good review thread

06-13-2009, 06:44 PM	#6
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 40 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	No undercoat, I did that 1 year ago and it rusted 10x worse. Wirewheel it, either patch it up with some sheetmetal, or get some rust bullet.

06-13-2009, 07:56 PM	#8
PinkPanther Zilvia Junkie Join Date: Oct 2004 Location: Johnston City, IL Age: 38 Posts: 372 Trader Rating: (3) Feedback Score: 3 reviews	my S14 rusted up in the same place. i sandblasted the rust away and painted over the bare metal with POR15. Its the best stuff out there, kind of expensive but better than rust bullet.

06-14-2009, 05:52 PM	#11
VQMaxFan Zilvia Junkie Join Date: May 2008 Location: Mobile AL Age: 35 Posts: 464 Trader Rating: (3) Feedback Score: 3 reviews	POR15 that ish

06-14-2009, 08:59 PM	#14
onehundredoctane Post Whore! Join Date: Oct 2006 Location: Greensborough, NC Posts: 2,783 Trader Rating: (3) Feedback Score: 3 reviews	your really need to cut it out, either fab a piece to go back in, or cut the floor from a good one at the junk yard, it just depends on how serious you are about fixing it, if your not really concerned and just want to prevent it from spreading then strip the area in question down to bare metal, including a 2 inch area past the affected rust area, then por15 the hell out of it.

06-15-2009, 01:55 PM	#15
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 40 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	Doesnt por15 need a properly prepped surface to work? ive heard rusty surfaces are ineffective for por15. POR stands for paint over rust, but my research has wound up concluding that the metal needs to be clean and prepped for the por15 to actually be effective.