Title says it all, really. I got my vehicle Rust Checked this summer. (Also had it done a week or two after I purchased my vehicle on 2016, as instructed by my dad. He says it's best to do it when you get the car and then in the summer so the rust proofing can really seep into the metal.) Here's a couple pictures of what it looks like: http://imgur.com/a/armPC

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In any case, the first time I had it done was in November. The rubber was not warped at this time. When I had it done last month is when I started to notice the warping. I brought it to Nissan and they told me it was not covered under warranty essentially because "I got it rust proofed and it wasn't their product that I used".

My questions are:

1) Did it warp because of a mix of the oil + heat?
2) Where could I potentially get something like this fixed other than at the dealer?
3) Any rubber/seal products out there like this that I can substitute so I don't have to deal with this dealership anymore? Or that won't warp with Rust Check?

Any help would be much obliged. Thanks.