| Re: Trailer Re-Paint
[Re: SurfCityRacing]
#187568 08/10/09 08:51 PM 08/10/09 08:51 PM |
Joined: Apr 2008 Posts: 235 JJ_
enthusiast
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enthusiast
Joined: Apr 2008
Posts: 235 | Had tough time getting paint to stick to even the cleaned surfaces of trailer. As several some have said, Ospho is not a paint -- it's a metal cleaner or treatment. (Several posts seem confusing.) If you "paint" with Ospho, rust will come back because the surface is not actually painted. It is just prepped for the paint. After you strip the rust off, the surface has to be coated again. There is a cold galvanizing spray if you have minor touch-ups. Also Krylon makes what they call a cold galvanizing primer. It's hard as heck to get paint to stick to zinc galvanizing if even little bits are left on the metal. You've got to clean and "etch" the surface in order to get the paint to bond. I used an inexpensive wire cup brush in a drill and buffed the small rust areas, then used cold galvanizing spray. No Ospho. If you've got a massive amount of rust, then what J and others said about blasting is prob better. | | | Re: Trailer Re-Paint
[Re: SurfCityRacing]
#187610 08/11/09 10:15 AM 08/11/09 10:15 AM |
Joined: Jul 2001 Posts: 1,200 Vancouver, BC Tornado
veteran
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veteran
Joined: Jul 2001
Posts: 1,200 Vancouver, BC | Hey SurfCity...can they do whole trailer hot-dip galv work? Frankly you would be better off finding someone that does Media Blasting...
Agreed. Here's the process from the anodizer I referred to in my previous post. LA Anodizing does all of the work for my custom trailer parts.
The galvanizing process consists of the following basic steps:
Oil and Grease Removal -- A hot alkaline cleaner is used to remove dirt, oil, grease and soluble markings. This process is known as caustic cleaning. This cleaning will NOT, however, remove epoxies, paint, and welding slag. Those contaminants must be removed by sandblasting, which we can arrange for you.
Pickling -- A dilute solution of hot sulfuric acid is used to remove surface rust and mill scale to provide a chemically clean metallic surface, readying the metal for the hot-dip process. This portion of the process can take anywhere from 30 minutes to 1-1/2 hours, depending on the complexity or the thickness of the part.
Fluxing -- Your steel parts will pass through this flux (a zinc ammonium chloride solution), which floats on top of our zinc bath. The fluxing process removes oxides and is intended to prevent oxidation of the steel prior to the zinc coating. This flux is then pushed aside to ensure clean removal of the steel parts from the zinc bath.
Galvanizing -- This is where the steel actually gets the zinc coating. The steel is immersed into a bath of molten zinc, which is heated between 820 and 850 F. During the galvanizing process, the steel comes up to the bath temperature and the zinc metallurgically bonds to the steel, creating a series of highly abrasion-resistant zinc-iron alloy layers, topped by an impact resistant pure zinc layer.
Inspection -- The final step in the hot-dip process to ensure compliance with the specifications. Coating thickness, uniformity, adherence and appearance are evaluated. Electronic testing gauges are used to give quick and convenient measurements of the coating. Additionally, Certificates of Compliance can be issued to satisfy the acceptable workmanship.
J
Mike Dobbs Tornado CAN 99 "Full Tilt"
| | | Re: Trailer Re-Paint
[Re: Tornado]
#187614 08/11/09 10:30 AM 08/11/09 10:30 AM |
Joined: Nov 2003 Posts: 749 Santa Cruz, CA SurfCityRacing
old hand
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old hand
Joined: Nov 2003
Posts: 749 Santa Cruz, CA | Hey SurfCity...can they do whole trailer hot-dip galv work?
yep. They usually dip it in once, flip it, and do the other side. Our kettle size measures 5' wide x 8'6 deep x 32' long, allowing us to process most any size structure. Additionally, various larger items can be successfully galvanized thru progressive dipping procedures. Last I knew, that spray galv was banned in CA. J
Last edited by SurfCityRacing; 08/11/09 10:32 AM.
| | | Re: Trailer Re-Paint
[Re: TurboCat]
#187625 08/11/09 01:03 PM 08/11/09 01:03 PM | andrewscott
Unregistered
| andrewscott
Unregistered | we're talking about a trailer right? go find $1.00 spray crap at the dollar store (i suggest rust color.. then you dont have to worry if you miss spots) and spray it.. it may need a second coat in about 2 years.... with all your saved tiome... go sailing | | |
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