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Old 04-20-2014, 11:25 AM
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What Color Primer and Why?

Is there a certain reason grey or black epoxy primer is used on bare metal?

What color do you like and why?

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Old 04-20-2014, 01:42 PM
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I'll just say this... I made the mistake of using some red oxide I had as guide coat. Definitely wrong color to use. I was always freaking out I had rust coming through the primer.


[color=gray]Sent from AutoGuide.com Free App[/color]
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Old 04-20-2014, 03:50 PM
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A couple of reasons drive primer color. One is top coat color. Gray primer is used under lighter colored top coats and black is used under dark top coats.
Reason for this is it takes less top coat to cover the specific (light or dark) base primer.
Another reason is paint chips. A white car with black primer will really show the chips whereas a white car with grey primer will not show as much.
Mark
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Old 04-20-2014, 04:07 PM
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Black for very dark paints and a lighter color for lighter color paints. I personally prefer a medium gray (SPI epoxy, and probably not available Canada) for all colors as I can see any bodywork imperfections easier.

Dave W
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Old 04-20-2014, 05:45 PM
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Quote:
Originally Posted by Lizer View Post
I'll just say this... I made the mistake of using some red oxide I had as guide coat. Definitely wrong color to use. I was always freaking out I had rust coming through the primer.


[color=gray]Sent from AutoGuide.com Free App[/color]

Ya, that would freak me out too.
I'll skip the red guide coat.
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Old 04-20-2014, 05:46 PM
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Quote:
Originally Posted by astroracer View Post
A couple of reasons drive primer color. One is top coat color. Gray primer is used under lighter colored top coats and black is used under dark top coats.
Reason for this is it takes less top coat to cover the specific (light or dark) base primer.
Another reason is paint chips. A white car with black primer will really show the chips whereas a white car with grey primer will not show as much.
Mark
Thanks.

Now, that makes sense.
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Old 04-20-2014, 05:47 PM
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Quote:
Originally Posted by Irelands child View Post
Black for very dark paints and a lighter color for lighter color paints. I personally prefer a medium gray (SPI epoxy, and probably not available Canada) for all colors as I can see any bodywork imperfections easier.

Dave W
SPI is available here. I will order a can of grey tomorrow.

Thanks guys.
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Old 04-20-2014, 06:22 PM
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But you're asking for use on bare metal, and I can't think of any reasons that color would matter for bare metal. That's assuming you're putting 2k over it, which has so much solids it will block out any color beneath it. If you're using it as the final primer before basecoat, then yes for the reasons already stated above.

On bare metal, black does make it easy to tell when you've sanded through the gray 2k, if you're even using 2k.
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Old 04-20-2014, 06:30 PM
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Quote:
Originally Posted by Lizer View Post
But you're asking for use on bare metal, and I can't think of any reasons that color would matter for bare metal. That's assuming you're putting 2k over it, which has so much solids it will block out any color beneath it. If you're using it as the final primer before basecoat, then yes for the reasons already stated above.

On bare metal, black does make it easy to tell when you've sanded through the gray 2k, if you're even using 2k.
With the SPI epoxy(also by definition a 2K) you don't need any urethane based 2K as it is a sandable epoxy.
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Old 04-20-2014, 06:42 PM
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Quote:
Originally Posted by Irelands child View Post
With the SPI epoxy(also by definition a 2K) you don't need any urethane based 2K as it is a sandable epoxy.
I use all SPI. I still use 2k. I'd be there all day if I was trying to build with epoxy. I still like the 2k because it's faster to sand time, and SPI's has minimal to no shrinkage. My work isn't perfect so I require something higher building.

By traditional nomenclature, when 2k is used (even though epoxy is 2k) it's in reference to high build primer, and epoxy is....epoxy.
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Old 04-20-2014, 07:04 PM
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Quote:
Originally Posted by Lizer View Post
But you're asking for use on bare metal, and I can't think of any reasons that color would matter for bare metal. That's assuming you're putting 2k over it, which has so much solids it will block out any color beneath it. If you're using it as the final primer before basecoat, then yes for the reasons already stated above.

On bare metal, black does make it easy to tell when you've sanded through the gray 2k, if you're even using 2k.

I'm doing the interior of the car and since grey is good all around, it will lighten things up in there nicely.
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Old 04-21-2014, 06:15 AM
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at the shop its gray for lite colors and black for dark but on my personal car its always black, only because I think it looks better,and at the rate I'm going it may never get painted.
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Old 04-21-2014, 07:47 AM
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first coat black , second coat gray . will easily show you highs and lows . for light colors such as yellow i use white . it is much harder to hide a dark sealer than a lighter one .

tinting gray with black every other coat makes for a good guide coat.
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Old 04-21-2014, 08:56 AM
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I like the looks of black on a project that is going to be in primer for a while but since the ragtop is going to be red I ordered gray. I thought it would be less likely to darken the red paint. I understand many guys always paint red over a white under coat.

The black I used under the dark blue on the roadster was perfect. The few chips I have gotten did not show badly at all.

Pugsy, You,will not need primer....Just clear coat will work on yours.


John
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Old 04-21-2014, 02:47 PM
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Like others above have said, I prefer to start with black on bare metal to see the imperfections better, then coat with gray (epoxy or 2K depending on the shape of the panels) for blocking. Seal with the closest color of epoxy to your base, I mix the colors to make different shades of epoxy for sealer.

Kelly
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