350z Sill Rust Removal

[LewisH05]

Hi,

 

Took my skirts off and noticed the dreaded rust underneath them.

Can anyone give me a bit of a step by step for removing this rust.

My current plan is to cut all the rust out, use hydrate-80 rust converter on any left over surface rust in the sill then weld the new panel in and use Dynax S50 as a cavity wax inside the sill.

The main question I have is with this current approach the new steel i will be welding in will be bare metal inside the sill so surely this will just form rust again?

I have heard of people using zinc rich weld through primers to protect the inside before welding but from what i am reading most people avoid using these as they make the welds really bad.

Am I missing something?