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Antique Tractor Paint and Bodywork

preping sandblasted sheetmetal

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Nylon

06-26-2007 18:44:30




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I have never had anything sandblasted before. I got a bunch of my parts back and found them to be quite rough. I somehow doubt epoxy primer works like a filling primer. What is the best course of action?




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CNKS

10-18-2007 17:58:18




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 Re: preping sandblasted sheetmetal in reply to Nylon, 06-26-2007 18:44:30  
Not where I live, it will last months. I do resand it before priming, though.



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PhilC

07-01-2007 06:55:33




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 Re: preping sandblasted sheetmetal in reply to Nylon, 06-26-2007 18:44:30  

Nylon said: I have never had anything sandblasted before. I got a bunch of my parts back and found them to be quite rough. I somehow doubt epoxy primer works like a filling primer. What is the best course of action?


First step is to sand the parts well with a DA and 180 - 200grit paper. My choice is 180 because I can go direct to primer and not need any additional sanding steps.

An important note about "sandblasting", the process embeds microscopic media particles in the surface and it's necessary to sand the surface to remove them prior to applying any undercoatings.

I have a fender for my 62 Falcon that was media blasted almost 4 years ago. All I've done is DA it with 180 grit and store it in my unheated garage, there's still not a spec of rust on it and it's just like it was when I finished sanding it 4 years ago. Then again, the dry climate here in eastern WA is nice to parts like that, and not everyone could get away with what I did. :wink:

Rod (NH) uses a great product for treating metal, Picklex20, I use it too.

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Rod (NH)

06-27-2007 12:57:04




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 Re: preping sandblasted sheetmetal in reply to Nylon, 06-26-2007 18:44:30  
I don't know what was used for a blast grit on your parts. I use the standard grit size of Black Beauty. It leaves what appears to be a "rough" surface when you drag your finger or a rag across it. However, the profile is not very deep and two coats of epoxy primer will cover it nicely, even though epoxy is not considered a "filler primer" (surfacer). If there are no other imperfections that require a surfacer product, I apply the topcoat directly to the epoxy. No sanding or scuffing is required unless the epoxy time window is exceeded. After the 2 coats of epoxy and 3 coats of acrylic urethane, there is no indication of the blast profile whatsoever. I think it's important for sandblasted surfaces (at least those resulting from a white-metal blast), to pre-treat the surface very soon after the blast process if a primer, preferably epoxy, cannot be applied right away. For that, I use Picklex 20, which is easy to apply and goes a long way. That protects the raw metal from minor rusting until the primer can be applied. I can usually prime the same day, immediately after blasting, in which case I don't bother with that additional pre-treatment. Remember that even finger prints can initiate the rusting process, especially in humid weather. A white-metal blast leaves the metal surface in a very raw state - more so than any other process and it's very susceptable to early rust developing. This is for sheet metal and other steel. For castings, I definitely apply the epoxy right after blasting since I am nervous about using a phosphoric acid product like Picklex 20 on castings. If priming is not feasible to do at the time, then I'll defer the blasting until it is.

Rod

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Circus

06-27-2007 10:39:31




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 Re: preping sandblasted sheetmetal in reply to Nylon, 06-26-2007 18:44:30  
DA it using 100 grit then refinish normally.



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CNKS

06-26-2007 19:25:20




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 Re: preping sandblasted sheetmetal in reply to Nylon, 06-26-2007 18:44:30  
Necessary or not, I sand sheet metal with 180 after sand blasting, then use two coats of epoxy (MP170), then use MP182 surfacer. Actually I get more damage with a fiber wheel on a drill than with sandblasting, the MP182 fills the scratches.



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Johnsdeere

10-18-2007 17:24:41




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 Re: preping sandblasted sheetmetal in reply to CNKS, 06-26-2007 19:25:20  
YOu need to prime bare steel with in 4 hours after blasting or stripping to prevent rust.



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