Best practices for adding flattening agent

[scogin918]

What are/is the best method(s) for adding a flattening agent to paint to ensure consistency? Do you guys do it by weight or by measuring the fluid?. I am planning on using the Sherwin Williams Dimensions single stage gloss on the car but with a flattening agent to achieve a satin finish. I want to do the firewall and trunk area first then cut in/jamb the car and paint the body a little later.

[HSLD]

Shoot test panels. Start at 5%, then 10% etc...

Label each panel and choose the one that looks the closest to the finish you desire.

I usually use HOK and use 8/2/2/1.

Clear/hardner/reducer/flatner

[Alchemist]

Here are a few previous threads discussing the satin black look!

https://www.pro-touring.com/forum/showthread.php?t=45283&highlight=SEM+Hot+Rod+Black

https://www.pro-touring.com/forum/showthread.php?t=44637&highlight=SEM+Hot+Rod+Black

https://www.pro-touring.com/forum/showthread.php?t=43535&highlight=SEM+Hot+Rod+Black