I've done some research on them and they simply don't work. The US government has shut them down a bunch of times basically as false advertising.
It's right in the fine print that they don't protect bare metal... Only painted metal... Painted metal doesn't rust !!
If you get a stone chip and rust starts, they won't cover it.
The problem is that it is based on real science so a new company pops up and and introduces some new electronic wizardry and claims it works.
" ...New car salespeople are not corrosion specialists. Corrosion research has found that cathodic protection can slow rust… but on boats, NOT CARS. That’s why corrosion experts say “Buyer Beware”! For electronic rust proofing to work, you need a completed circuit of protective electrons. In ships, the seawater completes the circuit. On bridges, the wet soil completes the circuit. On cars, the circuit is incomplete. “The only way to complete the circuit on all metal in your car is to drive into seawater or to be buried in soil!” (Corrosion-doctors.org). That’s why cathodic protection isn’t proven to work for cars..."
Krown sent repeated requests to the makers of these devices asking for a workable test for their device because they always failed the test that they give their product.
The companies have never responded.
Your friend probably has a new truck and new vehicles almost always last the length of the paint warranty.
Even our car did.. Then,.. Right on cue,.. Two months after the warranty expired, they rusted through.
It's right in the fine print that they don't protect bare metal... Only painted metal... Painted metal doesn't rust !!
If you get a stone chip and rust starts, they won't cover it.
The problem is that it is based on real science so a new company pops up and and introduces some new electronic wizardry and claims it works.
" ...New car salespeople are not corrosion specialists. Corrosion research has found that cathodic protection can slow rust… but on boats, NOT CARS. That’s why corrosion experts say “Buyer Beware”! For electronic rust proofing to work, you need a completed circuit of protective electrons. In ships, the seawater completes the circuit. On bridges, the wet soil completes the circuit. On cars, the circuit is incomplete. “The only way to complete the circuit on all metal in your car is to drive into seawater or to be buried in soil!” (Corrosion-doctors.org). That’s why cathodic protection isn’t proven to work for cars..."
Krown sent repeated requests to the makers of these devices asking for a workable test for their device because they always failed the test that they give their product.
The companies have never responded.
Your friend probably has a new truck and new vehicles almost always last the length of the paint warranty.
Even our car did.. Then,.. Right on cue,.. Two months after the warranty expired, they rusted through.
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