Try painting some of the Truck coat with a small dense sponge roller and sponge brush on some scrap first. If I remember correctly Truck Coat is an enamel type paint so should have similar properties to yacht paint.
I built a large extension a few years back and all the paintwork was Dulux liquid gloss, I put it all on with the sponge tools and had no runs at all, normally I end up with runs and drips everywhere, it's a good paint but horrible to put on.
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