Krown rust proofing

[ralph33ca]

I am considering rust proofing. I noticed that there seems to be plugs in the doors already.
Are these factory drilled holes?

 

[ralph33ca]

Corrosion Free

I ended up going with CorrosionFree rust proofing. No dipping.

One thing I can say about doing the rust proofing, is that everything gets lubed up. I noticed subtle differences when turning the steering wheel and how the bumps feel.

I am considering rust proofing. I noticed that there seems to be plugs in the doors already.
Are these factory drilled holes?