Galvanized Hood

dodsonish

dodsonish

Grease Police President
Any tips on restoring galvanized metal after soaking it with caustic? :confused: :confused:
 
Not sure I know what you mean. What does the damage look like?
 
Picture is a bit blurry.
 

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Have you tried a mild degreaser and rubbing the sheet metal by hand? Have several wet towells on hand. You might try polishing the hood also. Looks like you left the SH on too long.
 
I've tried scrubbing with a scotch brite pad and mild degreaser, but had very little improvement. The SH was left on too long after the washer went down. Instead of nuetralizing the hood they worked on the washer, and then cleaned the hood. It probably dwelled for an hour.....foamed. FEAR THE FOAM!!!
 
Josh , The caustic eats the zinc off of the surface of the metal. Once it is gone it is gone, buy, buy. There is no way you can restore it. You could put something on the surface to prevent it ftom rusting, thats about all.

Galvanizing is a process where zinc is applied to prevent rusting. In the galvanizing process they use caustic to prepare the surface of steel or iron to clean it. then the surface is dipped or coated in zinc. Zinc is also one of te ingredients of solder, and it has a low melting point. Thus the term , Hot dipped galvanization. Just a little FYI.

Michael T
 
Michael hit that one square on the head......I learn'd same lesson yaer ago ,only i ruined one filter.. when i use caustic on canopy it gets 1-3 minutes dwell rinse repeat. Hope you get it worked out w/out going thru insurance comp.
 
You can use the SH, just make sure you rinse it immediately. If your washer goes down throw buckets of water if you have too. You can also use butyl cleaners, they won't etch the surface.
 
We had the same problem a while back. We used a product form "Meguiar's" that we purchased at Checker auto parts. We rubbed it into the surface with soft rags. It took a lot of rubbing but the surface came out to the customer's satisfaction. I will try to find out the exact product as we don't have any at present. The end result came out about three times darker than the original hood but everybody was happy.
 
The customer has given the ok to remove the coating from the entire inside hood surface as a last resort. I have recieved a couple of ideas and will try them before resorting to this final step. The customer has been surprisingly easy to deal with, and has promised future business from additional locations. It is amazing how far accountability gets you in this industry. He couldn't believe I followed up with intentions on fixing our error.

c glentzer-
If you could get the product info before this comming Sunday I would like to give it a try.

Thanks all for the calls and tips.
 
Industry standard. To bare metal. What are they crying about. LOL. If they wanted a pretty hood, should of went with Stainless Steel. Just kidding.

Sometimes ya gotta do what ya gotta do to please the customer. Like Josh said it can go a long way.
 
The product that we used is Meguiar's all surface cleaner. In reviewing the work log for this it took two people 3.5 hours to clean a 20 foot hood. The product was sprayed onto the hood VERY liberally, allowed to sit for about two minutes and then wiped off. Unfortunately I have no pictures to show you but as I said it darkened the hood about three shades darker that when we originally started.The places that had been badly burned it probably darkened about five times darker. Long story short the customer was satisfied. If the option is on the table to burn the rest of the hood it would probably be faster to do that.
 
Josh, The best thing to do is take some potash and put a light coat on hood let it sit for a short time. Basicly like you were going to clean it again and hit it with hot water. But I dont think you will get it any better then where you have it. What you maybe able to do is equal out the crappy look to the hood. Short dwell old style with a pump-up, light chem. Good Luck

Matt
 
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