Using an eco-friendly car rust proof product could provide good protection from rust. Then again, it might offer no protection at all. One thing is for certain, just because an earth-friendly product doesn't contain harmful chemicals doesn't mean that it won't offer reliable rust protection. The bottom line is that eco-friendly rust proof products come in both effective and ineffective variations. If you are considering purchasing a particular product for your vehicle, first make sure that other users have been satisfied with it. There are some products on the market that claim to prevent rust, but they are not worth the cost. They might work for a limited time and then stop working shortly after or require frequent reapplication. Rely on the reviews of other for each product and you should be able to find a good rust proofing product.