# Re: [MBZ] touchups

```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.

Thatâ€™s not difficult math.

-D

> On Aug 11, 2017, at 11:46 PM, Craig via Mercedes <mercedes@okiebenz.com>
> wrote:
>
> On Fri, 11 Aug 2017 16:20:54 -0400 Dan--- via Mercedes
> <mercedes@okiebenz.com> 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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