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Mixing paint to match the existing paint... hotblues20 09-19-2006
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Posted by Norminn on September 19, 2006, 5:35 pm
hotblues20@netscape.net wrote:

> Hi everyone ~
>
> I am doing a scrape and paint on my garage, and I do not have enough
> house paint left to do the job. I brought a fresh chip of the color I
> need to Lowe's (charcoal gray). They matched it up using Olympic flat
> exterior 25 year paint, but I notice now that it is slightly darker
> than the original.
>
> Can I mix in a bit of flat white a little at a time, mix it up and
> match it to the existing, or is that too difficult to do?
>
> I am going to fully cover the siding, I just don't want the garage to
> be a shade darker than the house if I can help it.
>
> Thoughts are appreciated.
>
>
> Bluesman
>

Typical procedure at a good paint store is to mix the color, put a dab
on a stick (with first color), dry with hair dryer, adjust color as
needed.

Yes, you can add white paint of the same type. Let a sample dry before
you proceed. Usual advice is to mix remains of one can with part of the
next to blend any color differences.

If you have some of the original house paint left, the color formula
should be on the can.

Posted by jeffc on September 19, 2006, 8:39 pm

>
> If you have some of the original house paint left, the color formula
> should be on the can.

The problem is that paint, especially exterior but interior also, will
rarely match the original formula after a year or more after being painted.



Posted by Richard J Kinch on September 20, 2006, 4:17 am
> Can I mix in a bit of flat white a little at a time, mix it up and
> match it to the existing, or is that too difficult to do?

Considered the possibility that the store didn't perform the match
properly, or the metering pumps didn't work right, or the kid behind the
counter counted the wrong number of pumps? These guys are not as careful
as anesthesiologists injecting curare.

Colors have at *least* 4 degrees of freedom, and you thus need at least 4
ingredients (tint and proportion) to adjust color. So, no, just adding
some white won't fix a general problem in paint matching. You can't assume
you're just missing some white.

Analyzing tints for components is not really something humans can do,
although they are very good at a simple "this differs from that".


Posted by Norminn on September 20, 2006, 7:45 am
Richard J Kinch wrote:
>>Can I mix in a bit of flat white a little at a time, mix it up and
>>match it to the existing, or is that too difficult to do?
>
>
> Considered the possibility that the store didn't perform the match
> properly, or the metering pumps didn't work right, or the kid behind the
> counter counted the wrong number of pumps? These guys are not as careful
> as anesthesiologists injecting curare.

I could challenge that, but we don't want to go there :o)
>
> Colors have at *least* 4 degrees of freedom, and you thus need at least 4
> ingredients (tint and proportion) to adjust color. So, no, just adding
> some white won't fix a general problem in paint matching. You can't assume
> you're just missing some white.

His paint is too dark (charcoal gray). Adding white would help correct
that problem. After that, if it is too cool or too warm there are ways
to correct that, too.
>
> Analyzing tints for components is not really something humans can do,
> although they are very good at a simple "this differs from that".
>

Posted by on September 20, 2006, 11:51 am
I'd try the advice to go back to Lowes when they aren't busy and see
what they can do. If that doesn't work, you could try lightening it
with some white of the same paint, however anyone that has tried to
tint paint can tell you that it is far from simple. Adding some white
will make it lighter, but that may not be all that is required.

If that doesn't work, then I'd go to a local real paint store, where
they hopefully can do a better job.


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