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Best way to restore the underbody of a car?

If you do decide to remove the undercoating, a cheap small Harbor Freight needle scaler works very well.
well I am going to billings montana on saturday, and they have a harbor freight. I might as well pick one up!
 
I used an air chisel and needle scaler Set at about 40 psi and just knocked the undercoating off the sub frame rails then painted them black, sprayed over the existing undercoating to give it a new look.
which black paint did you use?
 
which black paint did you use?
VHT Chassis black, you can get it at just about any auto parts store. I was at harbor freight last weekend and they have their own version of chassis black also, never used it though.
 
Do you have a lift? I have done this, I would drop everything, tank, rear, trans, lines, cables, all plugs.
heat gun with scraper, then use this guy https://www.amazon.com/gp/product/B007TDFRI6/ref=ox_sc_sfl_title_2?ie=UTF8&psc=1&smid=ATVPDKIKX0DER to get it perfect.
then prime it and paint it body color. reassemble and call it restored.
I'm 18 years old, and just starting out my adult life and I don't have a lift -yet-. But I plan on getting one when I build a shop, eventually. What I do have, is some tall a$$ jackstands. I want to buy a rotisserie, but I'm not sure if it'd fit in my barn. A charger is a VERY long car, no doubt.
 
Just re-undercoat it again with some 3M spray cans.Having a mint undercarriage is a PIA and not worth the effort, unless you are creating a museum piece.
The car is not going to be a museum piece by any means, but I want to do the best job I can to prevent any rust issues down the road. I bought this car almost 3 years ago, when I was 16. It's really special to me, my first hot rod and I got to drive it during the end of my senior year in high school. I learned how to work on cars with this project, and I'm learning every day. I plan on keeping it as long as I can, hopefully the rest of my life. The less rust I have to deal with in 20 or 30 years, the better.
 
I'm 18 years old, and just starting out my adult life and I don't have a lift -yet-. But I plan on getting one when I build a shop, eventually. What I do have, is some tall a$$ jackstands. I want to buy a rotisserie, but I'm not sure if it'd fit in my barn. A charger is a VERY long car, no doubt.
LOL, I think we've all been there! Stick with the hobby and your arsenal of tools will only grow.
 
LOL, I think we've all been there! Stick with the hobby and your arsenal of tools will only grow.
Yeah no kidding. Just in the past 8 months my tool collection has doubled. Maybe even tripled. Within the next couple years, I want to buy a couple acres of land and build a shop to work on my projects.
 
Yeah no kidding. Just in the past 8 months my tool collection has doubled. Maybe even tripled. Within the next couple years, I want to buy a couple acres of land and build a shop to work on my projects.
Man - you're some kind of machine for 18 years old. I'm sure you'll nail it all in the next few years. Keep up the motivation. You've got a productive life ahead of you.
 
Man - you're some kind of machine for 18 years old. I'm sure you'll nail it all in the next few years. Keep up the motivation. You've got a productive life ahead of you.
Thank you, I appreciate the kind words. I think the best way to learn is trial by fire. It's going to be a fun car!
 
That h.f. needle scaler is crap mine lasted 2 hours
 
Yeah no kidding. Just in the past 8 months my tool collection has doubled. Maybe even tripled. Within the next couple years, I want to buy a couple acres of land and build a shop to work on my projects.
When I was 18 I had a socket set, a hammer and a few screwdrivers. It didn't take much to double my tool supply!
 
That h.f. needle scaler is crap mine lasted 2 hours
I've stripped all the undercoating off 3 cars with mine and it still works fine. You must have got a bad one. Imagine that, an inferior tool from Harbor Freight lol.
 
I'm 18 years old, and just starting out my adult life and I don't have a lift -yet-. But I plan on getting one when I build a shop, eventually. What I do have, is some tall a$$ jackstands. I want to buy a rotisserie, but I'm not sure if it'd fit in my barn. A charger is a VERY long car, no doubt.
I have a 70 charger on a spinner right now if you want me to measure it, I believe its 19, that one is on a Derrick weaver, I have a couple now and have had a few different rotors over the years, including customs, a Rotary lifts proto type (for testing), 2 separates for truck beds and cabs, I used a bunch of them over the years. And the DW is a great lift for the money, I have no complaints about it and for the money there may be stuff that costs less, but when it comes to holding your car upside down or on its side, I would tend to not skimp.
https://www.derekweaver.com/car-rotisserie/ Same lift other companies like redline sell for more money, DW gave me the best price, I know bought 4 from him, kind of a group buy and it worked out. No complaints from anyone I know that uses them.

A friend of mine that bought one to restore his car when his car was done sold it on Craigslist for $150 more than we paid! Not many tools you can do that with.
 
I've stripped all the undercoating off 3 cars with mine and it still works fine. You must have got a bad one. Imagine that, an inferior tool from Harbor Freight lol.

I have had high end air tools die in the first 15 minutes, 1 in particular I am thinking of was a snap on crud thug actually, lol and another one that didnt make day 1 was a Hutchins board sander, I also had an ir air ratchet last a few weeks after maybe 10 uses. I think you are more likely to get a bad air tool than a bad electric tool for some reason, and we have air dryers, lubers, regulators, everything. On the other hand I have IR impacts that I beat to death and wont quit and a bucket full of cheapy throw away air tools that I have gotten over the years to get me out of a jam that I still grab once and a while and work, like an off brand drill/mini recip saw/die grinder that I bought at a swap meet about 25 years ago for $20, came in a blow molded case, and them tools still work, you couldnt count the hours I have held them thing against metal and all 3 still work, even loaned them out to at least a dozen friends who used them for projects over the years.

in my opinion air tools are a gamble no matter what you spend, I appreciate nice stuff, so I tend to buy nice stuff and have mixed luck.

As far as a needle scaler, it will work, I am not a huge fan of them, I have a couple, dont grab them often, I used to use them for cleaning welding stuff, but now I discovered the air belt sander and its my go to guy...
 
Well if you say yours did all that I'll give it another shot it's not super expensive so no big deal I guess . I'm getting ready to put the 72 up on the rotisserie and start banging it out .
 
Well if you say yours did all that I'll give it another shot it's not super expensive so no big deal I guess . I'm getting ready to put the 72 up on the rotisserie and start banging it out .
I bet if you take it back, they will replace it with another one. I have heard they are really good about warranting things out. I am not a fan of cheap tools. This scaler and my blast cabinet are all that I have from HF, and I replaced the gun of the cabinet a long time ago with a better brand.
 
Up until 4 mos. ago, i had a Mac pneumatic 90 degree die grinder,,,i bought the kit in 94 for 190.00. I used that tool extensively with cut off whls,,roloc abrasives & 5" polishing pads. I never oiled it during use because i didnt want to scatter oil on whatever medium i was working & contaminate. Occassionaly i would oil at end of day and blow it through just to inhibit rust. Tool never gave up....some ******* tweaker stole it off the bench. I cant get over it, like losing an old Friend,,,,it had no real value,,,,asswipe might have gotten one or two hits off the glass dick......worthless pissants.
I ran a gauntlet of substance abuse in my time.....i NEVER stole anything from anyone to support my vices. That bullshit starts in the individual heart....******** are ******** with or without substance issues. Cant blame the gun,,,,have to blame the user.
Sorry, i just really miss my 90 degree tool.
 
I have an air hammer,/chisel, scaler and air saw from HF...the I my one it don't care for is the saw.... Each tool was $20 +/-...Did you oil the scaler? Moisture will kill even the most expensive air tools, if you do t have a dryer you need at least a desicant...
 
I picked up a needle scaler ( as recommended by many people on the site ) and thought I'd give it a try . . .

Here's what I had to deal with on my convertible ( spare tire well and frame rails ) Lots of tiny, hard to get to areas

The before shot . . . ( this is the driver side )

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The after shot . . . ( this is the passenger side - forgot to get the drive side pic - for example only )

118796-88f6d33fd2481a2d2e72140969c85186.jpg


I had spend months scraping the undercoat off with a very stiff painters putty knife - the stuff came off, but was torture on the elbows and shoulders. The area on my car, from the rear axle back includes a bunch of "hard to get to" areas like what you see above. After months of scraping it off by hand, I got the needle scaler and gave it a try . . . In about 3-4 hours I completed the WHOLE are from the axle back on my car - all of the hard to get to areas, looked incredible, and it didn't hurt the elbows and shoulders much at all.

My overall evaluation of the needle scaler:

Had I got it when I started on the car, I would have finished the car MUCH FASTER than I did doing it by hand. My bad for not listening to the recommendations of the forum members on this site.

I did not use a torch ( heat ) and a scraper, after welding under the car and having "molten" metal dropping on me, I didn't want to go through that "dodge the hot sh*t" again . . .

Best lessons learned are the ones you learn by cost and pain - Cost me more time, and more pain, to try and do it by hand when the needle scaler can get it done much faster, will less pain, and with better results too . . . and it does not do very much ( if any ) damage to the metal too.

That's my $0.02 . . . for what it's worth . . . Good luck ! ! !

Found these pics from my build . . .

Look at this area . . .

118536-e0172ff7b84fd325a80fe648c38a20c4.jpg


And here's what came off of it with the needle scaler

118535-645956d6fbc22c8f60d6d1f2b27e74d0.jpg


And here's a picture with one of the putty knife that was used

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Well yesterday I made it to billings, and I picked up a cheapo heat gun at harbor freight, along with some scrapers. I also bought a much needed drill, and cut off wheel. Next time I get paid (this friday) I'll buy myself a nice big air compressor and needle scaler.
 
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