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I had mine undercoated off the lot in 2013 and the coating is still intact and strong today (no touch ups or undercoating since). I would never get any rust protection that involved drilling holes.
My winter beater (2005 ford focus) had holes drilled for rust check years back until 2012. Didn't stop it from rusting and even better the thing is carrying around gallons of water somewhere in the doors or rockers. Every time I brake or turn it sounds like I'm driving an aquarium.
Another issue I have with rust proofing is it logically doesn't make sense on modern cars. Go have a look at your average rusty car today, 90% of the rust you will find is A: surface rust spreading from a rock chip or dent or B: rust on the edge of panels such as around wheel wells (again most likely from paint chips) Neither of which krown would protect you from.
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