I have been Rust Checking my vehicles for many yers with very good results , I also live in Toronto and drive a 2003 XC70 and a 1990 740GL with no visible rust.
I work with a large Fleet and we have had great results with Crown.
The key is to find a good franchize that wants return customers tell them you intend to come back only if satisfied with the job.
Best time to undercoat your vehicle is in the summer or early fall when the chemical can flow into the seams and cavities.
Both products work well, again the dealer is the key.
John
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90-740GL , 92-945Turbo
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