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Old 11-07-2008, 01:16 PM
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Bare Metal

I need to paint a new bare metal panel ( no e-coat ). What grit should I sand panel with before applying epoxy primer ? About 180 ?

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Old 11-07-2008, 01:37 PM
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I am sure 180 would be fine....you also may want to use a metal prep to etch the bare metal.
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Old 11-07-2008, 03:31 PM
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I use 180 on a D/A sander then wipe it down really good with prep solvent then shoot it in epoxy.
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Old 11-07-2008, 05:33 PM
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You didn't say what brand of epoxy primer you are planning on using. You should follow their recommendations, as they vary from brand to brand. SPI for instance, recommends that you sand with 80 grit da before applying their epoxy on bare metal. There is no metal prep products required with their epoxy, and you are better off not using any. Any Quality epoxy primer should not need another product applied before it is put on bare metal.

Aaron
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Old 11-07-2008, 06:20 PM
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Quote:
Originally Posted by adtkart
You didn't say what brand of epoxy primer you are planning on using. You should follow their recommendations, as they vary from brand to brand. SPI for instance, recommends that you sand with 80 grit da before applying their epoxy on bare metal. There is no metal prep products required with their epoxy, and you are better off not using any. Any Quality epoxy primer should not need another product applied before it is put on bare metal.

Aaron
I agree, and the SPI is great stuf. sands almost as easy as high build
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Old 11-07-2008, 06:23 PM
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Bottom line is,
Unless you apply etching primer which "may" support your next step,or,be totally inappropriate for the next product.
Your dependant on the SCRATCH applied to support your next step.
IMO, 80 IS the grit for epoxy reguardless of brand.180 don't do JACK.
80 on bare metal really is not as intrusive as you may think. And, 80 DA paper really does not go far and depending on brand,may not go farther than a foot.
I recently did some metal fence posts.4"x4" and i used Mirka DA paper and 80 was only good for basically 2 sides on a 4' post and that was pushing it.The better SCRATCH you have,the BETTER you ADHERE with on bare metal.
Then,
It comes down to C-L-E-A-N. A good wipe down with Acetone or a solvent base grease & wax remover till it wipes clean is critical.
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Old 11-07-2008, 06:33 PM
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I am using SPI epoxy, I will sand with 80 grit. Thanks
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Old 11-08-2008, 10:14 AM
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you can actually go with no sanding at all, just wipe it clean with all purpose cleaner and then spray it with a self etching primer. this primer actually attaches its self to the bare metal and acts as an awesome foundation for the epoxy primer to lay over. you dont need to use to much of the self etch just a nice quick spray over, and your good.
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Old 11-08-2008, 10:55 AM
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There is no reason to apply self etch primer if you are using SPI epoxy, in fact you are better off not using that stuff.

Aaron
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Old 11-08-2008, 11:01 AM
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Unless I am mistaken I think it is mostly recommended NOT to apply epoxy over self etch, am I wrong about this?
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Old 11-08-2008, 11:50 AM
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Quote:
Originally Posted by oldred
Unless I am mistaken I think it is mostly recommended NOT to apply epoxy over self etch, am I wrong about this?
That is correct, it is not recommended. Doesn't SPI advertise their epoxy as self etching primer?

Vince
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Old 11-08-2008, 02:34 PM
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Quote:
Doesn't SPI advertise their epoxy as self etching primer?
They state this on the product discription page but it's not an actual etching epoxy,none are that I'm aware of.
SPI states and Barry always recommends a 80 gt buzz of bare metal or a blasted surface and if a corse grit is used to blast with,a quick knock down with 80. And, NEVER over a soda blasted job,unless it's absolutly CLEAN of residue but still won't guarantee it.
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Old 11-12-2008, 08:20 PM
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I want to ask a question just to make sure I'm not messing up something
I just spent a couple days sandblasting an entire truck bed.
When we finished we wiped it down with a thinner / cleaner.
Now I know you all speak of an 'epoxy' primer...
What I used is a urethane primer directly on the metal after I cleaned it.
It was called MAXX FILL 2K High Build Uretane primer. I don't remember it saying anything on the can about it being an 'epoxy'... which I suppose there are different kinda.
I suppose one is as good an another... and what I used will do a good job, adhere well, and give me no problems down the road..
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Old 11-12-2008, 09:24 PM
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I here you and know your polite. I have been using House of Kolor's Bare Metal primer with excellent results. It's no more then any other name brand, and I feel it's one of the best out there.
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Old 11-13-2008, 05:40 AM
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Quote:
Originally Posted by Pickup Guy
I want to ask a question just to make sure I'm not messing up something
I just spent a couple days sandblasting an entire truck bed.
When we finished we wiped it down with a thinner / cleaner.
Now I know you all speak of an 'epoxy' primer...
What I used is a urethane primer directly on the metal after I cleaned it.
It was called MAXX FILL 2K High Build Uretane primer. I don't remember it saying anything on the can about it being an 'epoxy'... which I suppose there are different kinda.
I suppose one is as good an another... and what I used will do a good job, adhere well, and give me no problems down the road..
A sandblasted metal surface offers excellent texture for adhesion-so that is good. But, you need to check the tech sheet on the primer you are using to see if it's recomended for use over bare metal. Epoxy primer offers the best corrosion resistance but there are some decent DTM urethane and epoxy hybrid surfacers out there. Urethane surfacers can't match the corrosion resistance and adhesion of a quality epoxy primer. Never use an acid etch primer over sandblasted metals. Some gun wash grade lacquer thinners have a lot of impurities in them so they really shouldn't be used as a prepaint cleaner, use a wax and grease remover solvent based or waterborne cleaner for best results.
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