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galvanizing?

while chemically stripping a replacement decklid in preparation for painting,
i came upon a dull medium dark grey surface. it can be scratched.
is this galvanization?
in the areas of previous dent repair, the surface was sanded to bright metal.
i was told the donor car was a 72, i didn't think they were galvanized.
but it could be a replacement to that car.
if it is galvanization, i shouldn't sand it before priming, right?
any opinions appreciated.
Old 08-24-2008, 05:30 PM
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Galvanizing can be taken off with abrasives. I'm not sure if paint stripper would affect it, but would steer clear of hard sanding until I had an answer.
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Old 08-24-2008, 06:09 PM
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Hi, I had the same question when stripping my car. A shop told me it is most likely etch primer and not a galvanised piece of metal.

Elflamo
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Old 09-08-2008, 01:55 PM
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Here is what the Galvanizing looks like. This picture was after the car was plastic media blasted. Best money spent during the restoration.

Chemical striper will not take it off. 36 grit paper on a palm sander will.
It eats paper quick and make a nice fine dust that can't be good for ya.
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Old 09-09-2008, 06:39 AM
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Heres it is at the Blaster. Cost was a grand but if you add up your time in sanding, it was a bargain.
Plastic media will not cause panel warping.

It will save you some money if you do all the taping and covering off all the openings to keep media out of places you don't want it.I triple taped all the seams and around the window openings and had very little media where I did not want it..
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Last edited by Ron.G; 09-09-2008 at 06:47 AM..
Old 09-09-2008, 06:42 AM
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bingo, that's what it looks like.
i won't sand it off, lite scuff then epoxy primer.
thanks
Old 09-09-2008, 10:58 AM
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Can the plastic media blasting take off the rubberized undercoating? I was going to soda blast it but I heard it's not strong enough.
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Old 09-15-2008, 04:59 PM
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I doubt that the plastic media, or walnut shells would have any effect. I've heard that sandblasting doesn't even touch it. However if I were to try any blasting method, it would be dry ice blasting. This stuff supposedly removes gum, tar, etc.

http://video.google.ca/videosearch?q=Dry+iCe+blasting&hl=en&emb=0&aq=f#q= Dry%20iCe%20blasting&hl=en&emb=0&aq=f&start=50

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Old 09-15-2008, 10:06 PM
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Sand will take it off; I built a booth in my garage and blasted my car (everything except the exterior panels). The car had the undercoating in the front wheel wells and sandblasting took it off fairly easily. Easily, that is, if you remember to change the ceramic blasting tip when needed. Otherwise, it takes a loooooong time. Oops.
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Old 09-15-2008, 10:49 PM
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Quote:
Originally Posted by 1968Cayman View Post
Sand will take it off; I built a booth in my garage and blasted my car (everything except the exterior panels). The car had the undercoating in the front wheel wells and sandblasting took it off fairly easily. Easily, that is, if you remember to change the ceramic blasting tip when needed. Otherwise, it takes a loooooong time. Oops.
I heard sand blasting will damage the galvanized coating?
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Old 09-16-2008, 06:06 AM
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That is true. Sandblasting with sand or other hard, course media, will take it off in just a short bit of time. You really have to be careful with what you blast the outer surfaces on your body panels with, so you won't knock off the zinc while doing it. A softer media like soda, plastic grains, or even walnut/pecan shells will do far less harm that the actual abrasive medias. Tony.
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Old 09-16-2008, 02:36 PM
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Not worried about the outer panels since, they'll all be fiberglass. My biggest concern is taking off the undercoating, without damaging the galvanize coating. I would hate to have to deal with rust 5yrs down the road.

Any suggestions on a sandblaster? Just need it for the one uses. I was looking at a cheap one at Harbor Freight for $150
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Last edited by armandodiaz; 09-16-2008 at 03:50 PM..
Old 09-16-2008, 03:41 PM
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I'm using 20-35 grit crushed glass on my car and it is going through the 42 year old undercoating. But I'm using a siphon feed blaster/30gallon 110v compressor, so I'm not shooting it with crazy psi. It will probably take me forever, but it is working
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Old 09-18-2008, 06:27 AM
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heat soften the undercoating (almost setting it on fire---obviously with an exhaust fan running) and then scrape it off with a pull-type paint scraper. Then wire brush or sandblast. Much faster. Just be careful not to over heat metal. Overheating should not be much of an issue as the undercoating will soften very quickly with just a propane torch. Here are some before, after and really after pictures.


Old 09-19-2008, 06:23 AM
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Quote:
Originally Posted by Ron.G View Post
Heres it is at the Blaster. Cost was a grand but if you add up your time in sanding, it was a bargain.
Plastic media will not cause panel warping.

It will save you some money if you do all the taping and covering off all the openings to keep media out of places you don't want it.I triple taped all the seams and around the window openings and had very little media where I did not want it..
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I'm now ABSOLUTELY going to have this done!
I have mine (78SC) on a rotisserie (just the tub) and will deliver it that way. Question is... how easy/difficult is it to remove all that dust and garbage that gets into places that it shouldn't be? Mine will be the full meal deal... everything but the interior. It just doesn't need it!

Thanks
Old 10-12-2009, 09:47 AM
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subscribed.
Old 10-19-2009, 12:35 PM
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