If it's just bronze strainers you're looking to antifoul, Primocon spray primer and then whatever regular bottom paint you use should be fine. I prefer Interlux Micron and haven't had a problem getting it to stick to the strainers when they're coated first with Primocon.

If you're talking running gear, there's no question that the PropSpeed works if it's applied properly. Funny looking stuff, but so what. And they're proud of it $$$$.