73 Z Cleaning the underside

Discussion in 'Tips 'n' Tricks Topic' started by Bob Lane, Nov 2, 2019.

  1. migzisonfire

    migzisonfire Restoring 2 71’s

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  2. thesalboy

    thesalboy Veteran Member

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    Mine had undercoating on most of it. I used a torch and scrapers to get most of it off. I then used twisted knot radial discs on my angle grinder, flipping them as they flattened. Twisted knot cups were harder to use and couldn't be un-flattened. I got some smaller radial and cup twisted knot brushes and used them on air tools in the tighter spaces. I went down to bare metal - even on my California car, there was rust under the original primer. It makes a mess, but not as bad as blasting - I've done both. Wear welding leathers and a full face shield - wires spit out at enough speed to break skin.

    For protection, after scrubbing with red Scotchbright and Ospho wiped off before it got tacky, I sprayed Summit epoxy primer, then UPOL Raptor bedliner within the 4-day curing window. I had to modify the shifter opening, and confirmed that everything is very durable. FYI for rattle can, I like 3M 03584 Professional Grade Rubberized Undercoating - I've used that in other spots, like the inside of the cowl sides.

    http://nastyz28.com/threads/camaro-rs-ls1-build-thread.312352/page-10
     
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  3. Silverback

    Silverback New Member

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    I used a pressure washer on both my truck and my Trans Am. In both cases I sprayed it down with a 5:1 solution of Superclean, scrubbed it a little with a stiff tire brush in the worst spots, pressure washed till I was tired of it, and then blew it off with an air hose.

    In the case of the TA that dissolved the bit of undercoating/tar that was on the bottom of it, a nice coat of diff lube and in most places where it was coated it took off the paint/primer down to the zinc coating on the steel. I fogged it with some etching primer and some paint and called it good (it's a "race car" that rarely even sees rain).

    On the truck this got most of the loose stuff off the bottom of the truck. Any remaining rust got a quick spray of HF Rust converter or Rustoleum brush on (both the top rated for a spray and brush on converter), but the rest got sprayed with Rustoleum rusty brown primer and then fogged with semigloss black Rustoleum (Using an HF spray gun, I have better ones, I didn't see the point in getting them dirty). It's been that way for a couple of years now and if you spray it off with a hose it's still a nice semi-gloss black, it REALLY looks like a new truck underneath (the bed sides are rusting now... but that's a different issue)
     
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  4. Staccato

    Staccato New Member

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    I just use a pressure washer, the result is ok but could be better.
     
  5. Bob Lane

    Bob Lane Member Lifetime Gold Member

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    Washed the Z down with nothing but Zep from Lowe’s and a electric pressure washer. Only found 3 small pencil eraser sized eraser holes under the back passenger seat. I’ll weld them up and sand the bottom and then put some paint on it. What color are you going for under the car and the firewall, inner fenders.
     
  6. Bob Lane

    Bob Lane Member Lifetime Gold Member

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  7. Bob Lane

    Bob Lane Member Lifetime Gold Member

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    Can anyone help me with posting pictures?
     
  8. Bob Lane

    Bob Lane Member Lifetime Gold Member

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    Clean as the day it was born!
     

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  9. hubedobeedo

    hubedobeedo 3rd times a charm

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    looks good, will be easy to find and fix any problems.nice pic!
     
  10. giggity

    giggity Veteran Member

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    im in process to paint the rear...about to put all new stuff back in, cant have a crappy looking undercarriage

    using wire brush on grinder, and bur-lock pads on die grinder.

    Mine has rubberized wheel-well coating, I dont think Im going to try to take that off...I hit with metal grinding wheel, and it didnt budge.

    20200104_201118 (1).jpg

    20200111_172025.jpg
     

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