Rust on Underside of Hood - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Driver_WT · 07-05-2018, 08:12 PM

The hood on my 53 Chevy Truck needs some work on the top side, but not too bad. On the other hand, the underside of the hood is covered with rust, no holes but lots of surface rust. Can I sandblast the underside of the hood, or will that cause problems with the hood? I thought I had seen somewhere that someone had warped their hood by having it sandblasted?

The rust on the underside is too heavy to just sand off.

Thanks.

Wade

**mongocanfly** · 07-05-2018, 08:51 PM

A blaster can ruin a body panel if they don't know what they're doing...even then it's a crap shoot....there are liquid options for removing rust....

_Ogre · 07-05-2018, 09:25 PM

pretty heavy metal on our trucks, i had my whole truk sandblasted
newer vehicles have thin metal and need soda/dryice/walnut shells
the whole bedside of my gmc sierra vibrates when i close the gas door

Foot Stomper · 07-06-2018, 12:32 AM

A reputable sandblaster will not destroy it so do your homework and spend the money.
Do NOT use liquid rust removal products as they can leave "latent defects".

**Dan in Pasadena** · 07-06-2018, 02:37 PM

My entire truck has been sand based piece by piece by a local shop that someone who buys-restores-sells Tri Five Chevy's uses. That was good enough for me. He sells very high dollar restorations and said he always got good results.

Do what Footstomper recommended - do your homework first.

b-mac · 07-06-2018, 04:10 PM

Not to poo-poo on the guys above, but it probably kind of depends on the restoration. Even blasting can leave rust in some areas. And you risk warping.

I've had success with chemical converters (phosphoric acid based), POR15, and even Molasses Baths or Electrolysis.

Driver_WT · 07-07-2018, 06:35 AM

Quote:

Originally Posted by Foot Stomper

A reputable sandblaster will not destroy it so do your homework and spend the money.
Do NOT use liquid rust removal products as they can leave "latent defects".

Is there any way to remove the latent defects from liquid rust removers?

**Dan in Pasadena** · 07-07-2018, 06:41 PM

He meant some of the harsh chemical that removed the rust gets stuck in seams and crevices in the metal. Pretty hard to do anything that would assure total removal of this material...which is why I would say to media blast it using a knowledgeable, EXPERIENCED blast shop.

Foot Stomper · 07-07-2018, 07:44 PM

Quote:

Originally Posted by Dan in Pasadena

He meant some of the harsh chemical that removed the rust gets stuck in seams and crevices in the metal. Pretty hard to do anything that would assure total removal of this material...which is why I would say to media blast it using a knowledgeable, EXPERIENCED blast shop.

Exactly.

Furthermore, what can't be removed my media blasting should be coated in 2k epoxy primer. After completion, any suspect seems should be treated with a penetrating wax spray to encapsullate the rust, keeping out air and moisture which fuels rust.

**mr48chev** · 07-08-2018, 02:19 PM

I'd agree that if you go to a media blaster or sand blaster do your homework to make sure that the person who is doing the sand blasting is well experienced with sheet metal.

One of the local to me powder coating shops (we seem to have several that stay busy) has one guy that the manager says she trusts to do sheet metal and he does all of the car sheet metal. They do a lot of bodies on rotisseries for some of the local resto shops.

07-05-2018, 08:12 PM	#1
Driver_WT Registered User Join Date: Dec 2017 Location: River John, NS Posts: 448	Rust on Underside of Hood The hood on my 53 Chevy Truck needs some work on the top side, but not too bad. On the other hand, the underside of the hood is covered with rust, no holes but lots of surface rust. Can I sandblast the underside of the hood, or will that cause problems with the hood? I thought I had seen somewhere that someone had warped their hood by having it sandblasted? The rust on the underside is too heavy to just sand off. Thanks. Wade __________________ 53 Chevy 3100, SBC 355, 700R4, S10 frame, Ford 8.8 rear with 4.11 gears, front disc & rear drum brakes

07-05-2018, 08:51 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,662	Re: Rust on Underside of Hood A blaster can ruin a body panel if they don't know what they're doing...even then it's a crap shoot....there are liquid options for removing rust.... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

07-05-2018, 09:25 PM	#3
_Ogre Registered User Join Date: Jan 2012 Location: Motown Posts: 7,680	Re: Rust on Underside of Hood pretty heavy metal on our trucks, i had my whole truk sandblasted newer vehicles have thin metal and need soda/dryice/walnut shells the whole bedside of my gmc sierra vibrates when i close the gas door __________________ cool, an ogre smiley Ogre's 58 Truk build how to put your truck year and build thread into your signature shop air compressor timer

07-06-2018, 12:32 AM	#4
Foot Stomper Registered User Join Date: Oct 2015 Location: Calgary, Alberta Posts: 1,252	Re: Rust on Underside of Hood A reputable sandblaster will not destroy it so do your homework and spend the money. Do NOT use liquid rust removal products as they can leave "latent defects". __________________ So when is this "Old enough to know better" supposed to kick in? My 1959 GMC build thread http://67-72chevytrucks.com/vboard/s...d.php?t=686989

07-06-2018, 02:37 PM	#5
Dan in Pasadena Senior Member Join Date: Nov 2008 Location: Glendora, CA Posts: 6,339	Re: Rust on Underside of Hood My entire truck has been sand based piece by piece by a local shop that someone who buys-restores-sells Tri Five Chevy's uses. That was good enough for me. He sells very high dollar restorations and said he always got good results. Do what Footstomper recommended - do your homework first. __________________ '55 Big Window Shortbed, Drive-It-&-Work-On-It slid down the "slippery slope" to a Frame-Off Rodstoration! LQ4/4l85e/C4 IFS/Mustang 8.8 rearend w/3.73's Dan's '55 Big Window "Build" - Well, Kinda!

07-06-2018, 04:10 PM	#6
b-mac Registered User Join Date: Mar 2014 Location: Wichita Posts: 519	Re: Rust on Underside of Hood Not to poo-poo on the guys above, but it probably kind of depends on the restoration. Even blasting can leave rust in some areas. And you risk warping. I've had success with chemical converters (phosphoric acid based), POR15, and even Molasses Baths or Electrolysis.

07-07-2018, 06:41 PM	#8
Dan in Pasadena Senior Member Join Date: Nov 2008 Location: Glendora, CA Posts: 6,339	Re: Rust on Underside of Hood He meant some of the harsh chemical that removed the rust gets stuck in seams and crevices in the metal. Pretty hard to do anything that would assure total removal of this material...which is why I would say to media blast it using a knowledgeable, EXPERIENCED blast shop. __________________ '55 Big Window Shortbed, Drive-It-&-Work-On-It slid down the "slippery slope" to a Frame-Off Rodstoration! LQ4/4l85e/C4 IFS/Mustang 8.8 rearend w/3.73's Dan's '55 Big Window "Build" - Well, Kinda!

07-08-2018, 02:19 PM	#10
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,635	Re: Rust on Underside of Hood I'd agree that if you go to a media blaster or sand blaster do your homework to make sure that the person who is doing the sand blasting is well experienced with sheet metal. One of the local to me powder coating shops (we seem to have several that stay busy) has one guy that the manager says she trusts to do sheet metal and he does all of the car sheet metal. They do a lot of bodies on rotisseries for some of the local resto shops. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.



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