Is it worth doing on an impreza? Ive always found the subaru metal quaility to be much higer thatn adverage. Bt as I have my skirts off at the mo wondered if it was worth doing the sills. And maybe a few other bits? Opinions please. Or if there is already some protection please let me know? Cheers.

 

I'd do the underside for sure, esp if you have a JDM car as they are not normally treated to as much underbody protection as a UK spec car. Worth doing the floor pan, suspension, ARB's etc these all tend to rust..