I’ve used fluid film in my shop for about ten years. It’s a great product. Without a lift diy would be a pain.
Not easy to find people that have heard of any of these products, let alone finding a shop that applies them. I'm in the north and only just heard of them. Seems like they should be wildly popular.
Some of the products are said to damage rubber and plastic, I think Fluid Film warns against getting it on rubber, also that it could strip factory undercoat (paint or wax). Can't tell if they are just covering themselves or if it is a real issue.
Did you see or hear of any downside after application?
I haven’t seen any negative side effects. Only time I’ve seen undercoat cause bushing failure is with petroleum based products. The best test for me was my cousins 2011 f250. We fluid film it every fall. No rust anywhere when he traded it in for a 2021. He also does a good job washing it in the New Hampshire winters.
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