I haven’t used Krown, but if you’re ok with respraying it every year, Fluid Film is some good stuff. I personally go for a more permanent solution and when I had the front bumper reinforcement off, I sprayed everything with Eastwood Internal Frame coating. It’s more like paint than an undercoating. It’s thick enough to cover in one application, but thin enough to seep into the pinch weld seems and drip out the other side. I can’t speak for its longevity, since I just started using it, but I’m very happy with it so far. It’s a bit pricey though.
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