Thanks for the reply. Interlux is just what they call International in the US. They sell Brightside here, which I’ve used and agree is an excellent paint. However, where I used it in the bilge it has wrinkled and come away. It doesn’t seem to be able to stand long-term immersion. Maybe it’ll be OK on the outside of the hull where the boat dries quickly. The problem with the bilge is that in winter the boat cover leaks a little and it never really dries out properly down there.
I wasn’t sure if the one-pack paints would be OK on the outside of the hull because of that experience. They do claim that the two-pack versions are more waterproof. Sounds like you’ve found the one-pack ones are fine.