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Re: Painted prop
Primocon is intended as a primer on underwater metals, particularly prior to the application of bottom paint (Interlux indicates Trilux products) to outdrives and bronze props.
For over 20 years, I've used Trilux antifouling for underwater metal, but now use SeaHawk "Smart Solution" for underwater aluminum. It has a non-metallic biocide and is far more durable than Trilux in my experience.
BTW, I have also used Interlux 2000 as a barrier coat for underwater steel and aluminum, going back about 15 years. According to Interlux, "Interprotect® 2000E can be used above and below the waterline as a universal primer for all surfaces and has proven itself to be an excellent primer for all metals." It works as advertised if you get down to a clean, shiny surface--preferably sandblasted and coated immediately on a dry day.