Krown Rustrproofing Vs Corrosion Free 3000?

[Sierra1500wt]

Its that time to get my Truck Oil Sprayed, just bought it (its a 2013 Sierra) I keep reading all kinds of reviews on Krown and CF 3000 which is the two I have narrowed it down to and I really want to avoid drilling holes, going with the Factory Holes...

 

Has anyone have any thoughts on Either one of these 2? or experiences with them? I am in Ontario, Canada, so definitely need something durable/reliable..

 

Thanks

[BigZed]

I've used Krown on my 2010 every year and I have no rust, also live in Ontario.

 

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[montyss]

Have used Rust Check on m 09 since new and its still in great shape , basically the same as Krown

Drill the holes so it gets everywhere it needs too but tell them to leave the plastic hole covers out, then where they drilled the holes use some white lithium grease around the hole and plug it in and it won't rust