I applied the silver POR15 to my underside when I had the sub frame off, also to the drive shafts after cleaning those up. I was surprised just how far a small tin of the stuff would spread, being quite thin you cannot slap it on thick or it just runs everywhere. I did paint on top of the PRO, a couple of coats of matt black. I did my underside in 2017 and clean the underside with a damp rag every year pre-MOT and it is holding up well to this day.
I also applied some USA rubberised arch spray to my rear wheel arches and that is holding up well to. I used ABRO U-60 undercoating spray for that, it has a good reputation amongst US restorers.
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I applied the black POR15 to my underside when I had the sub frame off, also to the drive shafts after cleaning those up. I was surprised just how far a small tin of the stuff would spread, being quite thin you cannot slap it on thick or it just runs everywhere. I did mine in 2017 and clean the underside with a damp rag every year pre-MOT and it is holding up well to this day.
I also applied some USA rubberised arch spray to my rear wheel arches and that is holding up well to. I used ABRO undercoating spray for that, it has a good reputation amongst US restorers.