Re: [MBZ] touchups

[Dan Penoff via Mercedes]

You made this far more difficult than necessary, I think.  I just use the 
formula:

.7x = .5  which equals .7143 or 71.43%

Where the .7 represents 70% isopropyl alcohol and .5 represents the 50% 
dilution I want.

1 - .7143 = .2857 or 28.57%

Meaning that any bottle I fill using 70% isopropyl alcohol should contain 
28.57% water, no matter what the size.  So a 16 ounce spray bottle should have 
28.57% distilled water (4.6 ounces) and 71.43% isopropyl alcohol (11.4 ounces).

You could change the .7 value to represent whatever dilution of isopropyl 
alcohol you have.

That’s not difficult math.

-D

> On Aug 11, 2017, at 11:46 PM, Craig via Mercedes  
> wrote:
> 
> On Fri, 11 Aug 2017 16:20:54 -0400 Dan--- via Mercedes
>  wrote:
> 
>> True, but I was alluding to stronger stuff such as paint solvents and
>> things like my go to solvent, 3M Adhesive Remover.
> 
> OK. But at least you don't have to do any difficult math anymore.
> 
> 
> Craig


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Re: [MBZ] touchups

[Craig via Mercedes]

On Fri, 11 Aug 2017 16:20:54 -0400 Dan--- via Mercedes
 wrote:

> True, but I was alluding to stronger stuff such as paint solvents and
> things like my go to solvent, 3M Adhesive Remover.

OK. But at least you don't have to do any difficult math anymore.


Craig

> > On Aug 11, 2017, at 2:08 PM, Craig via Mercedes
> >  wrote:
> > 
> > With some trial and error, I figured out how to calculate it (I'll
> > leave the details of the derivation out):
> > 
> >Volume of water
> >- =  2*p - 1
> >Volume of alcohol mixture
> > 
> >where p = fraction of alcohol in alcohol
> >  mixture (for 70%, p = 0.7)
> > 
> > So, for 70% alcohol mixture, Volume of water = 0.4 Volume of alcohol
> > mixture
> > 
> > For 91% alcohol mixture, Volume of water = 0.82 Volume of alcohol
> > mixture

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Re: [MBZ] touchups

[Dan--- via Mercedes]

True, but I was alluding to stronger stuff such as paint solvents and things 
like my go to solvent, 3M Adhesive Remover.

-D

> On Aug 11, 2017, at 2:08 PM, Craig via Mercedes  wrote:
> 
> On Fri, 11 Aug 2017 12:51:27 -0400 Dan--- via Mercedes
>  wrote:
> 
>> It is, however, it's a common thing used by nearly everyone in the
>> detailing community.  A lot less aggressive than solvents, too.
> 
> Alcohol is a solvent ...
> 
> 
>> You want a 50-50 mix of water to alcohol if possible, so you'll have to
>> do some math if you're using typical 70% alcohol you find at the
>> pharmacy.  I usually go for the highest concentration I can get,
>> typically in the 90% range, which makes it a little easier to do the
>> math.
> 
> 
> With some trial and error, I figured out how to calculate it (I'll leave
> the details of the derivation out):
> 
>Volume of water
>- =  2*p - 1
>Volume of alcohol mixture
> 
>where p = fraction of alcohol in alcohol
>  mixture (for 70%, p = 0.7)
> 
> So, for 70% alcohol mixture,
> 
>Volume of water
>- =  2*0.7 - 1 = 0.4
>Volume of alcohol mixture
> 
>Thus, Volume of water = 0.4 Volume of alcohol mixture
> 
> For 91% alcohol mixture,
> 
>Volume of water
>- =  2*0.91 - 1 = 0.82
>Volume of alcohol mixture
> 
>Thus, Volume of water = 0.82 Volume of alcohol mixture
> 
> 
> Checking: For 100 ml (could also be ounces) 70% alcohol mixture
>  and 40 ml added water,
> 
>Alcohol = 70 ml
>Water   = 30 ml (from mixture) + 40 ml (added to mixture)
>= 70 ml
> 
> Checking: For 100 ml (could also be ounces) 91% alcohol mixture
>  and 82 ml added water,
> 
>Alcohol = 91 ml
>Water   = 9 ml (from mixture) + 82 ml (added to mixture)
>= 91 ml
> 
> 
> Craig
> 
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> 
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> 
> 


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Re: [MBZ] touchups

[Craig via Mercedes]

On Fri, 11 Aug 2017 12:51:27 -0400 Dan--- via Mercedes
 wrote:

> It is, however, it's a common thing used by nearly everyone in the
> detailing community.  A lot less aggressive than solvents, too.

Alcohol is a solvent ...


> You want a 50-50 mix of water to alcohol if possible, so you'll have to
> do some math if you're using typical 70% alcohol you find at the
> pharmacy.  I usually go for the highest concentration I can get,
> typically in the 90% range, which makes it a little easier to do the
> math.


With some trial and error, I figured out how to calculate it (I'll leave
the details of the derivation out):

Volume of water
- =  2*p - 1
Volume of alcohol mixture

where p = fraction of alcohol in alcohol
  mixture (for 70%, p = 0.7)

So, for 70% alcohol mixture,

Volume of water
- =  2*0.7 - 1 = 0.4
Volume of alcohol mixture

Thus, Volume of water = 0.4 Volume of alcohol mixture

For 91% alcohol mixture,

Volume of water
- =  2*0.91 - 1 = 0.82
Volume of alcohol mixture

Thus, Volume of water = 0.82 Volume of alcohol mixture


Checking: For 100 ml (could also be ounces) 70% alcohol mixture
  and 40 ml added water,

Alcohol = 70 ml
Water   = 30 ml (from mixture) + 40 ml (added to mixture)
= 70 ml

Checking: For 100 ml (could also be ounces) 91% alcohol mixture
  and 82 ml added water,

Alcohol = 91 ml
Water   = 9 ml (from mixture) + 82 ml (added to mixture)
= 91 ml


Craig

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Re: [MBZ] touchups

[Mountain Man via Mercedes]

-D wrote:
> IPA - ...

India Pale Ale?
tin.man

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Re: [MBZ] touchups

[Dan--- via Mercedes]

It is, however, it's a common thing used by nearly everyone in the detailing 
community.  A lot less aggressive than solvents, too.

You want a 50-50 mix of water to alcohol if possible, so you'll have to do some 
math if you're using typical 70% alcohol you find at the pharmacy.  I usually 
go for the highest concentration I can get, typically in the 90% range, which 
makes it a little easier to do the math.

-D

> On Aug 11, 2017, at 12:39 PM, Randy Bennell via Mercedes 
>  wrote:
> 
> Thank you. That sounds fairly benign.
> 
> RB
> 
>> On 11/08/2017 11:20 AM, Dan--- via Mercedes wrote:
>> IPA - isopropyl alcohol mixed 50-50 with clean water works fine to remove 
>> surface contamination or waxes.
>> 
>> -D
>> 
>>> On Aug 11, 2017, at 11:28 AM, Randy Bennell via Mercedes 
>>>  wrote:
>>> 
>>> What do you use to clean the surface of wax etc when touching up small 
>>> dings in paint on a car?
>>> 
>>> RB
>>> 
>>> 
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Re: [MBZ] touchups

[Randy Bennell via Mercedes]

Thank you. That sounds fairly benign.

RB

On 11/08/2017 11:20 AM, Dan--- via Mercedes wrote:

IPA - isopropyl alcohol mixed 50-50 with clean water works fine to remove 
surface contamination or waxes.

-D


On Aug 11, 2017, at 11:28 AM, Randy Bennell via Mercedes 
 wrote:

What do you use to clean the surface of wax etc when touching up small dings in 
paint on a car?

RB


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Re: [MBZ] touchups

[Dan--- via Mercedes]

IPA - isopropyl alcohol mixed 50-50 with clean water works fine to remove 
surface contamination or waxes.

-D

> On Aug 11, 2017, at 11:28 AM, Randy Bennell via Mercedes 
>  wrote:
> 
> What do you use to clean the surface of wax etc when touching up small dings 
> in paint on a car?
> 
> RB
> 
> 
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[MBZ] touchups

[Randy Bennell via Mercedes]

What do you use to clean the surface of wax etc when touching up small 
dings in paint on a car?


RB


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