@@ -99,38 +99,47 @@ Everything you need for this step is:
* a scale. You can also use anything to measure volumes.
* protection gloves.
* a vacuum chamber coupled with a vacuum pump going as low as 0.98 bar (9 inches of mercury).
* a piece of fishing wire or any very thin wire.
Here again, you can find all the safety and processing recommendations for Clear Flex [here](https://www.smooth-on.com/tb/files/CLEAR_FLEX_30_TB.pdf). Remember to check this first.
You need first to mix parts A and B in equal ratio to make the urethane. Recommendations are to mix it in equal ratio by volume. But it also works quite well in equal ratio by mass and since it is easier, that is this last way we will use here.
You need first to mix parts A and B in equal ratio to make the urethane. Recommendations are to mix it in equal ratio by volume. But it also works quite well in equal ratio by mass and since it is easier, that is this last way we will use here.
Note that you can use any elongated tool to conveniently guide the liquid flow out of the bottle. Also note that it is very important to carefully clean the A part bottle before closing if you do not want the
If you want to color the urethane that is now! First remember that the dye is called 'So Strong'... So if you want to keep the transparency of your sample just add very few.
And you strongly mix it with the fork taking care of scratching the edges of the cup:
Note that you can use any elongated tool to conveniently guide the liquid flow out of the bottle. Also note that it is very important to carefully clean the A part bottle before closing if you do not want the crosslinker to permanently seal the bottle. You will see what I am talking about the next time you will make a sample...
Then you strongly mix part A and B with the fork taking care of scratching the edges of the cup. First the liquid is blurry:
