In PS 24 Ultimate I have applied the Stylization Paint filter to a clip but I want to use keyframes to fade the effect in and out. In Editor => Effect, the controls for the effect do not provide a way to set the effect to zero, or not applied, and I just cannot find any instructions on how to do anything other than apply the effect to the entire clip. 

I know it can be done because there are transitions in the application of effects in this demo video: 

https://youtu.be/_b2Tu7_1-ao

Thanks for any help anyone can provide. 

You're right.There is no way to set it to zero.

Workaround : below your clip, duplicate it. Apply the effect to the clip on the top. Add fade out.  This way Studio will display the very same clip but without the effect.

That's what I ended up doing - I just transition into the clip with the effect applied, then to transition out of the effect, I fade in the track with the unmodified clip and simultaneously fade out the track with the effect. It works fine, it just seems kludgy and I thought there would be a better way. 

Thank you for your reply!