After Effects - Changing Scale Without Changing Stroke Width

kinda helpful. 00:00 - intro 00:26 - changing size of parametric shape 01:23 - changing shape scale without affecting stroke width 03:11 - changing layer scale without affecting stroke width 04:25 - expression explanation 05:55 - using layer style stroke 06:56 - prolonged outro here's the expression: origStrokeWidth = 121 (or whatever yours is); origStrokeWidth*100/transform.scale[0] note that the "transform.scale[0]" can be something else -- if you're using a null for the scale of the layer, you can pickwhip to the null's scale instead