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I haven't done it on an engine bay, but I've used a normal paint coating on the hard plastic exterior trim of a couple new cars recently and it turned out really well. I don't see why engine plastics like the cowl along the firewall or even engine covers wouldn't work. You just need to make sure they are really clean before you apply the coating.
As for a simple spray on product I've found PERL works well. In fact, I like PERL on engine bays better than I do on tires.
I would give Motorplast a try, it's not too expensive and I do feel you will like it. Koch makes some really good products, FSE is one I love, and this is right there for me as well.
I like it over all their other VRT products. I do find that it still runs at times in the rain (from bed rails)
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Good to know. That's what I dislike most about the water-based products. Even when I used 303 on the door panels, when they would get wet from rain when opening the door it would start to streak.
That is one of the reasons I quit using 303 as well. I hated seeing it run off the trim leaving a streaky appearance on the trim and a mess on the surrounding paint. It's also one of the reasons I now use a dedicated trim product or the paint coating I applied across the rest of the vehicle.