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q240z · 04-02-2008, 10:39 AM

That's an interesting point about the covered slip. As I understand it, EP-ZO is formulated to release H2O2 when the paint is exposed to sunlight in oxygenated water (http://www.epaint.com/questions/#1). I suspect it would be less effective in your circumstances. My boat is out in all kinds of weather, so it should function as designed.

Then again, the fact that you're getting lots of growth near the waterline seems to indicate that adequate light is getting through. Time to hit the laboratory!!! lol

But I'm still not sold on the idea of using paints containing any amount of Cu for old Al boats, though I can see how it would be a lesser concern on new hulls. For these old Roamers, where 40 years in the water have left their share of pits (barrier coats notwithstanding), my gut tells me Cu-free might be best.

Have you ever asked Marinette why they use a bottom paint that contains CU when CU-free alternatives are available? If they've got data showing that the Cu is so tightly bound in Trilux that it doesn't pose a problem even years down the line (on old hulls that do a few hundred hours/year), I'm willing to read.

04-02-2008, 10:39 AM	#5
q240z Registered User Join Date: Oct 2007 Location: Mid-Atlantic Posts: 107	That's an interesting point about the covered slip. As I understand it, EP-ZO is formulated to release H2O2 when the paint is exposed to sunlight in oxygenated water (http://www.epaint.com/questions/#1). I suspect it would be less effective in your circumstances. My boat is out in all kinds of weather, so it should function as designed. Then again, the fact that you're getting lots of growth near the waterline seems to indicate that adequate light is getting through. Time to hit the laboratory!!! lol But I'm still not sold on the idea of using paints containing any amount of Cu for old Al boats, though I can see how it would be a lesser concern on new hulls. For these old Roamers, where 40 years in the water have left their share of pits (barrier coats notwithstanding), my gut tells me Cu-free might be best. Have you ever asked Marinette why they use a bottom paint that contains CU when CU-free alternatives are available? If they've got data showing that the Cu is so tightly bound in Trilux that it doesn't pose a problem even years down the line (on old hulls that do a few hundred hours/year), I'm willing to read.