Mix Black and White Epoxy Sealer for Best Coverage

udtoy

Promoted Users
I cannot find the post I'm looking for! @crashtech posted about mixing some black epoxy into the white for best results under a dark blue and white rally stripes. It seems like it was a very small ratio of black to give just a light gray sealer coat - like 2%, but hoping for some help here to correct my memory on that!
 

DATEC

Member
Start with white and add black to make it grey, add just a small amount of black (it won't take much) mix and look and reside if you need to add more black to get it to the desired shade of grey. You could start at 2% black if you want, there is no set in stone ratio as to where to start or stop adding black or red. Just remember when tinting it is always easier to make light colors darker then to make dark colors lighter.
Doesn't take much black to turn white grey but would take a whole crap load of white to make black the same shade of grey.
 

udtoy

Promoted Users
Thanks DATEC. When painting a dark color such as a dark blue with white stripes what is that "desired shade" of grey for the sealer? Light? Dark? Middle? Or am I overthinking it?

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jcclark

Oldtimer
I heard that if you take a black and white copy on a copier of a part that is the final paint color
you'll have the correct shade of gray to match to.
 

texasking

Promoted Users
If you do a sprayout of the color on a graduated sprayout card, https://www.ebay.com/itm/PPG-ARMC46...Out-Cards-Axalta-BASF-Body-Shop-/323493602894, you can see which color gray on the card covers the best the first coat. Another way is to spray a card and hold your value finder next to it. Looking at them at an angle instead of straight on helps to see which value is the closest to the color. The closer it is, the faster it will cover, eliminating the need for excessive coats of base. I usually spray a medium-dark gray under dark blue, like #2 or #3 on your value finder.
 

crashtech

Combo Man
There isn't one undercoat shade available that is best for both colors. In the system you are using, do you know which of the two covers the worst?
 

udtoy

Promoted Users
No idea on the coverage. I'm using SPI for epoxy, 2K primer, epoxy sealer, Glasurit for color and SPI Universal Clear.
 

crashtech

Combo Man
Okay. Without doing sprayouts of your colors to determine coverage, we are all flying blind here. W67 doesn't pop up for me as a Porsche paint code, although there are mentions of it on the web. I wonder if that's the option code and not the paint code?

The proper shade of undercoat for 3AU white would of course be straight white.
 

udtoy

Promoted Users
The Navy Blue aka Dark Blue is a Porsche Paint to Sample color. Other codes listed for this color include: 347, 55, 3C7, Y33. I haven't purchased the color yet, and I will get spray out cards to test. Crash, are you suggesting I spray 2 different sealer colors? White under the stripes and the gray under the main blue base color?
 

crashtech

Combo Man
The Navy Blue aka Dark Blue is a Porsche Paint to Sample color. Other codes listed for this color include: 347, 55, 3C7, Y33. I haven't purchased the color yet, and I will get spray out cards to test. Crash, are you suggesting I spray 2 different sealer colors? White under the stripes and the gray under the main blue base color?
If the main body is to be white, then the primer color should be white. The dark blue color you mention should be a high coverage color because it has a healthy amount of black in it. Whether you might need a ground coat for the stripe will depend on your sprayout of the material. A good system will have that blue cover in 3 coats or less, which would not need a ground coat. A cheap system, who knows.
 

udtoy

Promoted Users
Thanks for the input and the advice. The base will be Glasiurit, which is a high quality system, so I should get decent results - my skills not withstanding!
 

crashtech

Combo Man
Glasurit is nice. They may have different versions of the white, so see if you can specify a high-coverage version.
 

crashtech

Combo Man
The approximate gray shade for that blue might be 2 parts white epoxy, and 1 part black. That's based on crossing one system to another based on experience, some fine tuning might be necessary.
 
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