If you're talking about a wira body, get the stiffer competition/track spec instead. Dont think you need for door sills.thinking of chasis only. Comfort spec as in the link
https://autofoam.net/autofoam/
Just kidding with him cause he mentioned tin milo which is actually the body panels.I think for doors they don't do it.....
Autofoam only stiffens it very slightly. IF the chassis can be straightened, the foam wont get in the way.ok but it will make the car panel workshop curse because adjusting a foamed chassis is not simple.
Please refer to the picture. That's from my car. The foam may be scraped out.