Used X5, lotta rust! Ziebart or Krown?

[Ziad]

Hi,

I can see plenty of rust under the X, at the edges of the doors, side of one of the fenders, bumper etc... Old owner really didn't bother taking care of it.

I have two options, bodyshop then go to ziebart or krown for rust protection.

I know ziebart does coat your car from under and "i'm not sure" if it makes holes into the doors to spray the inside of the doors etc etc... As far as I researched, the under coat gets flacky and holds water over the years. They said it costs 170$ with 5 yrs warranty.

Krown on the other hand drills holes, and sprays the car with a chemical solution. I understand that it's a bit more pricey than ziebart.

I'm from Montreal, so during winter, snow on the road + salt makes hell of a mess for cars.

Which one to choose? Ziebart or Krown?